77751994 has 4 divisors (see below), whose sum is σ = 116627994. Its totient is φ = 38875996.

The previous prime is 77751977. The next prime is 77752001. The reversal of 77751994 is 49915777.

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

It can be written as a sum of positive squares in only one way, i.e., 54567769 + 23184225 = 7387^2 + 4815^2 .

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 19437997 + ... + 19438000.

Almost surely, 2^77751994 is an apocalyptic number.

77751994 is a deficient number, since it is larger than the sum of its proper divisors (38876000).

77751994 is a wasteful number, since it uses less digits than its factorization.

77751994 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 38875999.

The product of its digits is 555660, while the sum is 49.

The square root of 77751994 is about 8817.7091129159. The cubic root of 77751994 is about 426.8125476370.

The spelling of 77751994 in words is "seventy-seven million, seven hundred fifty-one thousand, nine hundred ninety-four".