77972894 has 8 divisors (see below), whose sum is σ = 116996808. Its totient is φ = 38973960.

The previous prime is 77972893. The next prime is 77972929. The reversal of 77972894 is 49827977.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (77972893) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 9284 + ... + 15560.

It is an arithmetic number, because the mean of its divisors is an integer number (14624601).

Almost surely, 2^77972894 is an apocalyptic number.

77972894 is a deficient number, since it is larger than the sum of its proper divisors (39023914).

77972894 is a wasteful number, since it uses less digits than its factorization.

77972894 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12490.

The product of its digits is 1778112, while the sum is 53.

The square root of 77972894 is about 8830.2261579192. The cubic root of 77972894 is about 427.2163689798.

The spelling of 77972894 in words is "seventy-seven million, nine hundred seventy-two thousand, eight hundred ninety-four".