72991874 has 4 divisors (see below), whose sum is σ = 109487814. Its totient is φ = 36495936.

The previous prime is 72991873. The next prime is 72991879. The reversal of 72991874 is 47819927.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 47819927 = 29 ⋅1648963.

It can be written as a sum of positive squares in only one way, i.e., 72982849 + 9025 = 8543^2 + 95^2 .

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (72991873) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 18247967 + ... + 18247970.

Almost surely, 2^72991874 is an apocalyptic number.

72991874 is a deficient number, since it is larger than the sum of its proper divisors (36495940).

72991874 is a wasteful number, since it uses less digits than its factorization.

72991874 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 36495939.

The product of its digits is 254016, while the sum is 47.

The square root of 72991874 is about 8543.5281939021. The cubic root of 72991874 is about 417.9184116151.

The spelling of 72991874 in words is "seventy-two million, nine hundred ninety-one thousand, eight hundred seventy-four".