77720568 has 16 divisors (see below), whose sum is σ = 194301480. Its totient is φ = 25906848.

The previous prime is 77720567. The next prime is 77720579. The reversal of 77720568 is 86502777.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (77720567) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1619155 + ... + 1619202.

Almost surely, 2^77720568 is an apocalyptic number.

It is an amenable number.

77720568 is an abundant number, since it is smaller than the sum of its proper divisors (116580912).

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

77720568 is a wasteful number, since it uses less digits than its factorization.

77720568 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3238366 (or 3238362 counting only the distinct ones).

The product of its (nonzero) digits is 164640, while the sum is 42.

The square root of 77720568 is about 8815.9269506955. The cubic root of 77720568 is about 426.7550364919.

The spelling of 77720568 in words is "seventy-seven million, seven hundred twenty thousand, five hundred sixty-eight".