77973955 has 8 divisors (see below), whose sum is σ = 94397472. Its totient is φ = 61826688.

The previous prime is 77973949. The next prime is 77973983. The reversal of 77973955 is 55937977.

It is a happy number.

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

It is a cyclic number.

It is not a de Polignac number, because 77973955 - 2³ = 77973947 is a prime.

It is a Duffinian number.

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 in 7 ways as a sum of consecutive naturals, for example, 68439 + ... + 69568.

It is an arithmetic number, because the mean of its divisors is an integer number (11799684).

Almost surely, 2^77973955 is an apocalyptic number.

77973955 is a deficient number, since it is larger than the sum of its proper divisors (16423517).

77973955 is a wasteful number, since it uses less digits than its factorization.

77973955 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 138125.

The product of its digits is 2083725, while the sum is 52.

The square root of 77973955 is about 8830.2862354513. The cubic root of 77973955 is about 427.2183067238.

The spelling of 77973955 in words is "seventy-seven million, nine hundred seventy-three thousand, nine hundred fifty-five".