77770638 has 32 divisors (see below), whose sum is σ = 188536320. Its totient is φ = 23566680.

The previous prime is 77770621. The next prime is 77770657. The reversal of 77770638 is 83607777.

77770638 is a `hidden beast` number, since 7 + 7 + 7 + 7 + 0 + 638 = 666.

It is a junction number, because it is equal to n+sod(n) for n = 77770593 and 77770602.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 64870 + ... + 66057.

It is an arithmetic number, because the mean of its divisors is an integer number (5891760).

Almost surely, 2^77770638 is an apocalyptic number.

77770638 is an abundant number, since it is smaller than the sum of its proper divisors (110765682).

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

77770638 is a wasteful number, since it uses less digits than its factorization.

77770638 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 130949 (or 130943 counting only the distinct ones).

The product of its (nonzero) digits is 345744, while the sum is 45.

The square root of 77770638 is about 8818.7662402402. The cubic root of 77770638 is about 426.8466597619.

The spelling of 77770638 in words is "seventy-seven million, seven hundred seventy thousand, six hundred thirty-eight".