77817948 has 24 divisors (see below), whose sum is σ = 195542928. Its totient is φ = 23943936.

The previous prime is 77817941. The next prime is 77818009. The reversal of 77817948 is 84971877.

It is a self number, because there is not a number n which added to its sum of digits gives 77817948.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (77817941) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 249261 + ... + 249572.

It is an arithmetic number, because the mean of its divisors is an integer number (8147622).

Almost surely, 2^77817948 is an apocalyptic number.

77817948 is a gapful number since it is divisible by the number (78) formed by its first and last digit.

It is an amenable number.

77817948 is an abundant number, since it is smaller than the sum of its proper divisors (117724980).

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

77817948 is a wasteful number, since it uses less digits than its factorization.

77817948 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 498853 (or 498851 counting only the distinct ones).

The product of its digits is 790272, while the sum is 51.

The square root of 77817948 is about 8821.4481804293. The cubic root of 77817948 is about 426.9331963713.

The spelling of 77817948 in words is "seventy-seven million, eight hundred seventeen thousand, nine hundred forty-eight".