77538540 has 24 divisors (see below), whose sum is σ = 217108080. Its totient is φ = 20676928.

The previous prime is 77538511. The next prime is 77538541. The reversal of 77538540 is 4583577.

It is not an unprimeable number, because it can be changed into a prime (77538541) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 646095 + ... + 646214.

It is an arithmetic number, because the mean of its divisors is an integer number (9046170).

Almost surely, 2^77538540 is an apocalyptic number.

It is an amenable number.

77538540 is an abundant number, since it is smaller than the sum of its proper divisors (139569540).

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

77538540 is a wasteful number, since it uses less digits than its factorization.

77538540 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1292321 (or 1292319 counting only the distinct ones).

The product of its (nonzero) digits is 117600, while the sum is 39.

The square root of 77538540 is about 8805.5970836735. The cubic root of 77538540 is about 426.4216108526.

The spelling of 77538540 in words is "seventy-seven million, five hundred thirty-eight thousand, five hundred forty".