772991988108 has 24 divisors (see below), whose sum is σ = 1815752996400. Its totient is φ = 255934706880.

The previous prime is 772991988103. The next prime is 772991988143. The reversal of 772991988108 is 801889199277.

It is a super-2 number, since 2×772991988108² (a number of 25 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (772991988103) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 216159283 + ... + 216162858.

It is an arithmetic number, because the mean of its divisors is an integer number (75656374850).

Almost surely, 2^772991988108 is an apocalyptic number.

It is an amenable number.

772991988108 is an abundant number, since it is smaller than the sum of its proper divisors (1042761008292).

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

772991988108 is a wasteful number, since it uses less digits than its factorization.

772991988108 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 432322297 (or 432322295 counting only the distinct ones).

The product of its (nonzero) digits is 36578304, while the sum is 69.

The spelling of 772991988108 in words is "seven hundred seventy-two billion, nine hundred ninety-one million, nine hundred eighty-eight thousand, one hundred eight".