72523642 has 4 divisors (see below), whose sum is σ = 108785466. Its totient is φ = 36261820.

The previous prime is 72523631. The next prime is 72523651. The reversal of 72523642 is 24632527.

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., 59120721 + 13402921 = 7689^2 + 3661^2 .

It is a Smith number, since the sum of its digits (31) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 18130909 + ... + 18130912.

Almost surely, 2^72523642 is an apocalyptic number.

72523642 is a deficient number, since it is larger than the sum of its proper divisors (36261824).

72523642 is a wasteful number, since it uses less digits than its factorization.

72523642 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 36261823.

The product of its digits is 20160, while the sum is 31.

The square root of 72523642 is about 8516.0813758442. The cubic root of 72523642 is about 417.0228658242.

The spelling of 72523642 in words is "seventy-two million, five hundred twenty-three thousand, six hundred forty-two".