77631930 has 48 divisors (see below), whose sum is σ = 202310784. Its totient is φ = 20653920.

The previous prime is 77631919. The next prime is 77631937. The reversal of 77631930 is 3913677.

It is not an unprimeable number, because it can be changed into a prime (77631937) 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 23 ways as a sum of consecutive naturals, for example, 56107 + ... + 57473.

It is an arithmetic number, because the mean of its divisors is an integer number (4214808).

Almost surely, 2^77631930 is an apocalyptic number.

77631930 is an abundant number, since it is smaller than the sum of its proper divisors (124678854).

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

77631930 is a wasteful number, since it uses less digits than its factorization.

77631930 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2011 (or 2008 counting only the distinct ones).

The product of its (nonzero) digits is 23814, while the sum is 36.

The square root of 77631930 is about 8810.8983650931. The cubic root of 77631930 is about 426.5927409627.

The spelling of 77631930 in words is "seventy-seven million, six hundred thirty-one thousand, nine hundred thirty".