72140051 has 4 divisors (see below), whose sum is σ = 72582792. Its totient is φ = 71697312.

The previous prime is 72140009. The next prime is 72140053. The reversal of 72140051 is 15004127.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-72140051 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (72140053) 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 in 3 ways as a sum of consecutive naturals, for example, 221126 + ... + 221451.

It is an arithmetic number, because the mean of its divisors is an integer number (18145698).

Almost surely, 2^72140051 is an apocalyptic number.

72140051 is a deficient number, since it is larger than the sum of its proper divisors (442741).

72140051 is a wasteful number, since it uses less digits than its factorization.

72140051 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 442740.

The product of its (nonzero) digits is 280, while the sum is 20.

The square root of 72140051 is about 8493.5299493202. The cubic root of 72140051 is about 416.2863286266.

Adding to 72140051 its reverse (15004127), we get a palindrome (87144178).

The spelling of 72140051 in words is "seventy-two million, one hundred forty thousand, fifty-one".