72911642 has 4 divisors (see below), whose sum is σ = 109367466. Its totient is φ = 36455820.

The previous prime is 72911639. The next prime is 72911647. The reversal of 72911642 is 24611927.

It is a happy number.

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., 38700841 + 34210801 = 6221^2 + 5849^2 .

It is a super-2 number, since 2×72911642² = 10632215078272328, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 72911599 and 72911608.

It is not an unprimeable number, because it can be changed into a prime (72911647) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 18227909 + ... + 18227912.

Almost surely, 2^72911642 is an apocalyptic number.

72911642 is a deficient number, since it is larger than the sum of its proper divisors (36455824).

72911642 is a wasteful number, since it uses less digits than its factorization.

72911642 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 36455823.

The product of its digits is 6048, while the sum is 32.

The square root of 72911642 is about 8538.8314188769. The cubic root of 72911642 is about 417.7652314453.

The spelling of 72911642 in words is "seventy-two million, nine hundred eleven thousand, six hundred forty-two".