77938761 has 32 divisors (see below), whose sum is σ = 114386688. Its totient is φ = 47001600.

The previous prime is 77938753. The next prime is 77938769. The reversal of 77938761 is 16783977.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (77938753) and next prime (77938769).

It is not a de Polignac number, because 77938761 - 2³ = 77938753 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 77938761.

It is not an unprimeable number, because it can be changed into a prime (77938769) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 194161 + ... + 194561.

It is an arithmetic number, because the mean of its divisors is an integer number (3574584).

Almost surely, 2^77938761 is an apocalyptic number.

It is an amenable number.

77938761 is a deficient number, since it is larger than the sum of its proper divisors (36447927).

77938761 is a wasteful number, since it uses less digits than its factorization.

77938761 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 561.

The product of its digits is 444528, while the sum is 48.

The square root of 77938761 is about 8828.2932099019. The cubic root of 77938761 is about 427.1540212250.

The spelling of 77938761 in words is "seventy-seven million, nine hundred thirty-eight thousand, seven hundred sixty-one".