77951428 has 6 divisors (see below), whose sum is σ = 136415006. Its totient is φ = 38975712.

The previous prime is 77951417. The next prime is 77951429. The reversal of 77951428 is 82415977.

It can be written as a sum of positive squares in only one way, i.e., 42928704 + 35022724 = 6552^2 + 5918^2 .

It is not an unprimeable number, because it can be changed into a prime (77951429) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9743925 + ... + 9743932.

Almost surely, 2^77951428 is an apocalyptic number.

It is an amenable number.

77951428 is a deficient number, since it is larger than the sum of its proper divisors (58463578).

77951428 is a wasteful number, since it uses less digits than its factorization.

77951428 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19487861 (or 19487859 counting only the distinct ones).

The product of its digits is 141120, while the sum is 43.

The square root of 77951428 is about 8829.0105900945. The cubic root of 77951428 is about 427.1771610457.

The spelling of 77951428 in words is "seventy-seven million, nine hundred fifty-one thousand, four hundred twenty-eight".