1521680472 has 256 divisors, whose sum is σ = 4877107200. Its totient is φ = 435456000.

The previous prime is 1521680429. The next prime is 1521680527. The reversal of 1521680472 is 2740861251.

1521680472 is a `hidden beast` number, since 1 + 521 + 68 + 0 + 4 + 72 = 666.

It is a super-2 number, since 2×1521680472² = 4631022917732285568, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 6062347 + ... + 6062597.

It is an arithmetic number, because the mean of its divisors is an integer number (19051200).

Almost surely, 2^1521680472 is an apocalyptic number.

1521680472 is a gapful number since it is divisible by the number (12) 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 1521680472, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2438553600).

1521680472 is an abundant number, since it is smaller than the sum of its proper divisors (3355426728).

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

1521680472 is a wasteful number, since it uses less digits than its factorization.

1521680472 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 423 (or 413 counting only the distinct ones).

The product of its (nonzero) digits is 26880, while the sum is 36.

The square root of 1521680472 is about 39008.7230244724. The cubic root of 1521680472 is about 1150.2029816878.

The spelling of 1521680472 in words is "one billion, five hundred twenty-one million, six hundred eighty thousand, four hundred seventy-two".