77799998 has 16 divisors (see below), whose sum is σ = 118759824. Its totient is φ = 38216640.

The previous prime is 77799991. The next prime is 77800013. The reversal of 77799998 is 89999777.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (77799991) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 82208 + ... + 83148.

It is an arithmetic number, because the mean of its divisors is an integer number (7422489).

Almost surely, 2^77799998 is an apocalyptic number.

77799998 is a deficient number, since it is larger than the sum of its proper divisors (40959826).

77799998 is a wasteful number, since it uses less digits than its factorization.

77799998 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1627.

The product of its digits is 18003384, while the sum is 65.

The square root of 77799998 is about 8820.4307151068. The cubic root of 77799998 is about 426.9003674401.

The spelling of 77799998 in words is "seventy-seven million, seven hundred ninety-nine thousand, nine hundred ninety-eight".