77538560 has 72 divisors (see below), whose sum is σ = 202650336. Its totient is φ = 28190720.

The previous prime is 77538541. The next prime is 77538577. The reversal of 77538560 is 6583577.

It is a congruent number.

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, 11327 + ... + 16833.

It is an arithmetic number, because the mean of its divisors is an integer number (2814588).

Almost surely, 2^77538560 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 77538560, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (101325168).

77538560 is an abundant number, since it is smaller than the sum of its proper divisors (125111776).

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

77538560 is a wasteful number, since it uses less digits than its factorization.

77538560 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5539 (or 5525 counting only the distinct ones).

The product of its (nonzero) digits is 176400, while the sum is 41.

The square root of 77538560 is about 8805.5982193148. The cubic root of 77538560 is about 426.4216475158.

The spelling of 77538560 in words is "seventy-seven million, five hundred thirty-eight thousand, five hundred sixty".