77520738 has 16 divisors (see below), whose sum is σ = 155208960. Its totient is φ = 25812336.

The previous prime is 77520721. The next prime is 77520743. The reversal of 77520738 is 83702577.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 77520696 and 77520705.

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, 498 + ... + 12461.

It is an arithmetic number, because the mean of its divisors is an integer number (9700560).

Almost surely, 2^77520738 is an apocalyptic number.

77520738 is an abundant number, since it is smaller than the sum of its proper divisors (77688222).

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

77520738 is a wasteful number, since it uses less digits than its factorization.

77520738 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13961.

The product of its (nonzero) digits is 82320, while the sum is 39.

The square root of 77520738 is about 8804.5861912983. The cubic root of 77520738 is about 426.3889744435.

The spelling of 77520738 in words is "seventy-seven million, five hundred twenty thousand, seven hundred thirty-eight".