77631406090 has 64 divisors (see below), whose sum is σ = 163110528000. Its totient is φ = 26591580288.

The previous prime is 77631406081. The next prime is 77631406093. The reversal of 77631406090 is 9060413677.

It is not an unprimeable number, because it can be changed into a prime (77631406093) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 3862447 + ... + 3882493.

It is an arithmetic number, because the mean of its divisors is an integer number (2548602000).

Almost surely, 2^77631406090 is an apocalyptic number.

77631406090 is a gapful number since it is divisible by the number (70) formed by its first and last digit.

77631406090 is an abundant number, since it is smaller than the sum of its proper divisors (85479121910).

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

77631406090 is a wasteful number, since it uses less digits than its factorization.

77631406090 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21204 (or 21190 counting only the distinct ones).

The product of its (nonzero) digits is 190512, while the sum is 43.

The spelling of 77631406090 in words is "seventy-seven billion, six hundred thirty-one million, four hundred six thousand, ninety".