77490867978 has 96 divisors (see below), whose sum is σ = 173861550720. Its totient is φ = 24930218880.

The previous prime is 77490867931. The next prime is 77490868009. The reversal of 77490867978 is 87976809477.

77490867978 is a `hidden beast` number, since 7 + 7 + 490 + 8 + 67 + 9 + 78 = 666.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 62643576 + ... + 62644812.

It is an arithmetic number, because the mean of its divisors is an integer number (1811057820).

Almost surely, 2^77490867978 is an apocalyptic number.

77490867978 is an abundant number, since it is smaller than the sum of its proper divisors (96370682742).

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

77490867978 is a wasteful number, since it uses less digits than its factorization.

77490867978 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2332 (or 2329 counting only the distinct ones).

The product of its (nonzero) digits is 298722816, while the sum is 72.

The spelling of 77490867978 in words is "seventy-seven billion, four hundred ninety million, eight hundred sixty-seven thousand, nine hundred seventy-eight".