77703640 has 32 divisors (see below), whose sum is σ = 199810080. Its totient is φ = 26641152.

The previous prime is 77703629. The next prime is 77703653. The reversal of 77703640 is 4630777.

It is a happy number.

It is a junction number, because it is equal to n+sod(n) for n = 77703596 and 77703605.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 138477 + ... + 139036.

It is an arithmetic number, because the mean of its divisors is an integer number (6244065).

Almost surely, 2^77703640 is an apocalyptic number.

77703640 is a gapful number since it is divisible by the number (70) formed by its first and last digit.

It is an amenable number.

77703640 is an abundant number, since it is smaller than the sum of its proper divisors (122106440).

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

77703640 is a wasteful number, since it uses less digits than its factorization.

77703640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 277531 (or 277527 counting only the distinct ones).

The product of its (nonzero) digits is 24696, while the sum is 34.

The square root of 77703640 is about 8814.9668178615. The cubic root of 77703640 is about 426.7240509840.

The spelling of 77703640 in words is "seventy-seven million, seven hundred three thousand, six hundred forty".