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999581472 = 25310232

999581472 has 198 divisors, whose sum is σ = 3085794747. Its totient is φ = 318707136.

The previous prime is 999581467. The next prime is 999581497. The reversal of 999581472 is 274185999.

It is a powerful number, because all its prime factors have an exponent greater than 1 and also an Achilles number because it is not a perfect power.

999581472 is a `hidden beast` number, since 9 + 9 + 95 + 81 + 472 = 666.

It can be written as a sum of positive squares in only one way, i.e., 499790736 + 499790736 = 22356^2 + 22356^2 .

It is an ABA number since it can be written as A⋅BA, here for A=2, B=22356.

It is a Harshad number since it is a multiple of its sum of digits (54).

Its product of digits (1632960) is a multiple of the sum of its prime divisors (28).

It is an unprimeable number.

It is a polite number, since it can be written in 32 ways as a sum of consecutive naturals, for example, 43460053 + ... + 43460075.

Almost surely, 2999581472 is an apocalyptic number.

999581472 is a gapful number since it is divisible by the number (92) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 999581472

999581472 is an abundant number, since it is smaller than the sum of its proper divisors (2086213275).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

999581472 is an frugal number, since it uses more digits than its factorization.

999581472 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 86 (or 28 counting only the distinct ones).

The product of its digits is 1632960, while the sum is 54.

The square root of 999581472 is about 31616.1584004129. The cubic root of 999581472 is about 999.8604711993.

The spelling of 999581472 in words is "nine hundred ninety-nine million, five hundred eighty-one thousand, four hundred seventy-two".