77189472540 has 72 divisors (see below), whose sum is σ = 234169266240. Its totient is φ = 20581409664.

The previous prime is 77189472539. The next prime is 77189472551. The reversal of 77189472540 is 4527498177.

77189472540 is a `hidden beast` number, since 7 + 7 + 1 + 8 + 94 + 7 + 2 + 540 = 666.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 1889046 + ... + 1929474.

It is an arithmetic number, because the mean of its divisors is an integer number (3252350920).

Almost surely, 2^77189472540 is an apocalyptic number.

It is an amenable number.

77189472540 is an abundant number, since it is smaller than the sum of its proper divisors (156979793700).

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

77189472540 is a wasteful number, since it uses less digits than its factorization.

77189472540 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 51051 (or 51046 counting only the distinct ones).

The product of its (nonzero) digits is 3951360, while the sum is 54.

The spelling of 77189472540 in words is "seventy-seven billion, one hundred eighty-nine million, four hundred seventy-two thousand, five hundred forty".