989701578 has 24 divisors (see below), whose sum is σ = 2223775008. Its totient is φ = 329900364.

The previous prime is 989701481. The next prime is 989701633. The reversal of 989701578 is 875107989.

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

It is a Curzon number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1017726 + ... + 1018697.

It is an arithmetic number, because the mean of its divisors is an integer number (92657292).

Almost surely, 2^989701578 is an apocalyptic number.

989701578 is an abundant number, since it is smaller than the sum of its proper divisors (1234073430).

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

989701578 is a wasteful number, since it uses less digits than its factorization.

989701578 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2036440 (or 2036428 counting only the distinct ones).

The product of its (nonzero) digits is 1270080, while the sum is 54.

The square root of 989701578 is about 31459.5228507999. The cubic root of 989701578 is about 996.5553406128. Note that the first 3 decimals are identical.

The spelling of 989701578 in words is "nine hundred eighty-nine million, seven hundred one thousand, five hundred seventy-eight".