77620772 has 6 divisors (see below), whose sum is σ = 135836358. Its totient is φ = 38810384.

The previous prime is 77620729. The next prime is 77620787. The reversal of 77620772 is 27702677.

It can be written as a sum of positive squares in only one way, i.e., 68823616 + 8797156 = 8296^2 + 2966^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9702593 + ... + 9702600.

It is an arithmetic number, because the mean of its divisors is an integer number (22639393).

Almost surely, 2^77620772 is an apocalyptic number.

It is an amenable number.

77620772 is a deficient number, since it is larger than the sum of its proper divisors (58215586).

77620772 is a wasteful number, since it uses less digits than its factorization.

77620772 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19405197 (or 19405195 counting only the distinct ones).

The product of its (nonzero) digits is 57624, while the sum is 38.

The square root of 77620772 is about 8810.2651492449. The cubic root of 77620772 is about 426.5723019936.

The spelling of 77620772 in words is "seventy-seven million, six hundred twenty thousand, seven hundred seventy-two".