90477299978 has 32 divisors (see below), whose sum is σ = 146951763840. Its totient is φ = 41531676480.

The previous prime is 90477299971. The next prime is 90477299987. The reversal of 90477299978 is 87999277409.

It is a super-2 number, since 2×90477299978² (a number of 23 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (90477299971) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 6077528 + ... + 6092396.

It is an arithmetic number, because the mean of its divisors is an integer number (4592242620).

Almost surely, 2^90477299978 is an apocalyptic number.

90477299978 is a deficient number, since it is larger than the sum of its proper divisors (56474463862).

90477299978 is a wasteful number, since it uses less digits than its factorization.

90477299978 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16142.

The product of its (nonzero) digits is 144027072, while the sum is 71.

The spelling of 90477299978 in words is "ninety billion, four hundred seventy-seven million, two hundred ninety-nine thousand, nine hundred seventy-eight".