77231972 has 12 divisors (see below), whose sum is σ = 137173680. Its totient is φ = 38039496.

The previous prime is 77231963. The next prime is 77231981. The reversal of 77231972 is 27913277.

It is an interprime number because it is at equal distance from previous prime (77231963) and next prime (77231981).

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 143822 + ... + 144357.

It is an arithmetic number, because the mean of its divisors is an integer number (11431140).

Almost surely, 2^77231972 is an apocalyptic number.

It is an amenable number.

77231972 is a deficient number, since it is larger than the sum of its proper divisors (59941708).

77231972 is a wasteful number, since it uses less digits than its factorization.

77231972 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 288250 (or 288248 counting only the distinct ones).

The product of its digits is 37044, while the sum is 38.

The square root of 77231972 is about 8788.1722786937. The cubic root of 77231972 is about 425.8588804246.

The spelling of 77231972 in words is "seventy-seven million, two hundred thirty-one thousand, nine hundred seventy-two".