77972889 has 8 divisors (see below), whose sum is σ = 106381792. Its totient is φ = 50772960.

The previous prime is 77972887. The next prime is 77972893. The reversal of 77972889 is 98827977.

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

It is not a de Polignac number, because 77972889 - 2¹ = 77972887 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (77972887) by changing a digit.

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 in 7 ways as a sum of consecutive naturals, for example, 302092 + ... + 302349.

It is an arithmetic number, because the mean of its divisors is an integer number (13297724).

Almost surely, 2^77972889 is an apocalyptic number.

It is an amenable number.

77972889 is a deficient number, since it is larger than the sum of its proper divisors (28408903).

77972889 is a wasteful number, since it uses less digits than its factorization.

77972889 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 604487.

The product of its digits is 3556224, while the sum is 57.

The square root of 77972889 is about 8830.2258748007. The cubic root of 77972889 is about 427.2163598481.

The spelling of 77972889 in words is "seventy-seven million, nine hundred seventy-two thousand, eight hundred eighty-nine".