77012172 has 18 divisors (see below), whose sum is σ = 194669748. Its totient is φ = 25670712.

The previous prime is 77012171. The next prime is 77012189. The reversal of 77012172 is 27121077.

It is a tau number, because it is divible by the number of its divisors (18).

It is not an unprimeable number, because it can be changed into a prime (77012171) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 1069578 + ... + 1069649.

It is an arithmetic number, because the mean of its divisors is an integer number (10814986).

Almost surely, 2^77012172 is an apocalyptic number.

It is an amenable number.

77012172 is an abundant number, since it is smaller than the sum of its proper divisors (117657576).

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

77012172 is a wasteful number, since it uses less digits than its factorization.

77012172 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2139237 (or 2139232 counting only the distinct ones).

The product of its (nonzero) digits is 1372, while the sum is 27.

The square root of 77012172 is about 8775.6579240533. The cubic root of 77012172 is about 425.4545024705.

The spelling of 77012172 in words is "seventy-seven million, twelve thousand, one hundred seventy-two".