77697240 has 32 divisors (see below), whose sum is σ = 233092080. Its totient is φ = 20719232.

The previous prime is 77697239. The next prime is 77697281. The reversal of 77697240 is 4279677.

It is a super-2 number, since 2×77697240² = 12073722207235200, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 77697192 and 77697201.

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, 323619 + ... + 323858.

Almost surely, 2^77697240 is an apocalyptic number.

It is an amenable number.

77697240 is an abundant number, since it is smaller than the sum of its proper divisors (155394840).

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

77697240 is a wasteful number, since it uses less digits than its factorization.

77697240 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 647491 (or 647487 counting only the distinct ones).

The product of its (nonzero) digits is 148176, while the sum is 42.

The square root of 77697240 is about 8814.6037914361. The cubic root of 77697240 is about 426.7123350640.

The spelling of 77697240 in words is "seventy-seven million, six hundred ninety-seven thousand, two hundred forty".