77921412 has 12 divisors (see below), whose sum is σ = 181816656. Its totient is φ = 25973800.

The previous prime is 77921411. The next prime is 77921419. The reversal of 77921412 is 21412977.

It is a tau number, because it is divible by the number of its divisors (12).

It is not an unprimeable number, because it can be changed into a prime (77921411) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3246714 + ... + 3246737.

It is an arithmetic number, because the mean of its divisors is an integer number (15151388).

Almost surely, 2^77921412 is an apocalyptic number.

It is an amenable number.

77921412 is an abundant number, since it is smaller than the sum of its proper divisors (103895244).

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

77921412 is a wasteful number, since it uses less digits than its factorization.

77921412 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6493458 (or 6493456 counting only the distinct ones).

The product of its digits is 7056, while the sum is 33.

The square root of 77921412 is about 8827.3105757076. The cubic root of 77921412 is about 427.1223243519.

The spelling of 77921412 in words is "seventy-seven million, nine hundred twenty-one thousand, four hundred twelve".