77708540 has 48 divisors (see below), whose sum is σ = 200851392. Its totient is φ = 24592896.

The previous prime is 77708509. The next prime is 77708551. The reversal of 77708540 is 4580777.

It is a junction number, because it is equal to n+sod(n) for n = 77708494 and 77708503.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 19529 + ... + 23168.

It is an arithmetic number, because the mean of its divisors is an integer number (4184404).

Almost surely, 2^77708540 is an apocalyptic number.

77708540 is a gapful number since it is divisible by the number (70) formed by its first and last digit.

It is an amenable number.

77708540 is an abundant number, since it is smaller than the sum of its proper divisors (123142852).

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

77708540 is a wasteful number, since it uses less digits than its factorization.

77708540 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 42726 (or 42724 counting only the distinct ones).

The product of its (nonzero) digits is 54880, while the sum is 38.

The square root of 77708540 is about 8815.2447498637. The cubic root of 77708540 is about 426.7330205505.

The spelling of 77708540 in words is "seventy-seven million, seven hundred eight thousand, five hundred forty".