77428798 has 4 divisors (see below), whose sum is σ = 116143200. Its totient is φ = 38714398.

The previous prime is 77428763. The next prime is 77428807. The reversal of 77428798 is 89782477.

It is a happy number.

It is a semiprime because it is the product of two primes.

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, 19357198 + ... + 19357201.

It is an arithmetic number, because the mean of its divisors is an integer number (29035800).

Almost surely, 2^77428798 is an apocalyptic number.

77428798 is a deficient number, since it is larger than the sum of its proper divisors (38714402).

77428798 is a wasteful number, since it uses less digits than its factorization.

77428798 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 38714401.

The product of its digits is 1580544, while the sum is 52.

The square root of 77428798 is about 8799.3634997084. The cubic root of 77428798 is about 426.2203412427.

The spelling of 77428798 in words is "seventy-seven million, four hundred twenty-eight thousand, seven hundred ninety-eight".