77736728 has 8 divisors (see below), whose sum is σ = 145756380. Its totient is φ = 38868360.

The previous prime is 77736713. The next prime is 77736739. The reversal of 77736728 is 82763777.

It is a tau number, because it is divible by the number of its divisors (8).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4858538 + ... + 4858553.

Almost surely, 2^77736728 is an apocalyptic number.

It is an amenable number.

77736728 is a deficient number, since it is larger than the sum of its proper divisors (68019652).

77736728 is a wasteful number, since it uses less digits than its factorization.

77736728 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9717097 (or 9717093 counting only the distinct ones).

The product of its digits is 691488, while the sum is 47.

The square root of 77736728 is about 8816.8434260794. The cubic root of 77736728 is about 426.7846120326.

The spelling of 77736728 in words is "seventy-seven million, seven hundred thirty-six thousand, seven hundred twenty-eight".