72911842 has 4 divisors (see below), whose sum is σ = 109367766. Its totient is φ = 36455920.

The previous prime is 72911821. The next prime is 72911921. The reversal of 72911842 is 24811927.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 72437121 + 474721 = 8511^2 + 689^2 .

It is a super-2 number, since 2×72911842² = 10632273407665928, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 72911798 and 72911807.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 18227959 + ... + 18227962.

Almost surely, 2^72911842 is an apocalyptic number.

72911842 is a deficient number, since it is larger than the sum of its proper divisors (36455924).

72911842 is a wasteful number, since it uses less digits than its factorization.

72911842 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 36455923.

The product of its digits is 8064, while the sum is 34.

The square root of 72911842 is about 8538.8431300733. The cubic root of 72911842 is about 417.7656134280.

The spelling of 72911842 in words is "seventy-two million, nine hundred eleven thousand, eight hundred forty-two".