72010639 has 4 divisors (see below), whose sum is σ = 72192424. Its totient is φ = 71828856.

The previous prime is 72010619. The next prime is 72010643. The reversal of 72010639 is 93601027.

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

It is a cyclic number.

It is not a de Polignac number, because 72010639 - 2⁵ = 72010607 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (72010619) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 90297 + ... + 91090.

It is an arithmetic number, because the mean of its divisors is an integer number (18048106).

Almost surely, 2^72010639 is an apocalyptic number.

72010639 is a deficient number, since it is larger than the sum of its proper divisors (181785).

72010639 is a wasteful number, since it uses less digits than its factorization.

72010639 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 181784.

The product of its (nonzero) digits is 2268, while the sum is 28.

The square root of 72010639 is about 8485.9082601687. The cubic root of 72010639 is about 416.0372543529.

The spelling of 72010639 in words is "seventy-two million, ten thousand, six hundred thirty-nine".