77865140 has 12 divisors (see below), whose sum is σ = 163516836. Its totient is φ = 31146048.

The previous prime is 77865127. The next prime is 77865157. The reversal of 77865140 is 4156877.

It can be written as a sum of positive squares in 2 ways, for example, as 48748324 + 29116816 = 6982^2 + 5396^2 .

It is a junction number, because it is equal to n+sod(n) for n = 77865094 and 77865103.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1946609 + ... + 1946648.

It is an arithmetic number, because the mean of its divisors is an integer number (13626403).

Almost surely, 2^77865140 is an apocalyptic number.

It is an amenable number.

77865140 is an abundant number, since it is smaller than the sum of its proper divisors (85651696).

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

77865140 is a wasteful number, since it uses less digits than its factorization.

77865140 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3893266 (or 3893264 counting only the distinct ones).

The product of its (nonzero) digits is 47040, while the sum is 38.

The square root of 77865140 is about 8824.1226192750. The cubic root of 77865140 is about 427.0194822067.

The spelling of 77865140 in words is "seventy-seven million, eight hundred sixty-five thousand, one hundred forty".