72247051 has 4 divisors (see below), whose sum is σ = 74199712. Its totient is φ = 70294392.

The previous prime is 72247027. The next prime is 72247073. The reversal of 72247051 is 15074227.

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-72247051 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (72247951) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 976275 + ... + 976348.

It is an arithmetic number, because the mean of its divisors is an integer number (18549928).

Almost surely, 2^72247051 is an apocalyptic number.

72247051 is a deficient number, since it is larger than the sum of its proper divisors (1952661).

72247051 is a wasteful number, since it uses less digits than its factorization.

72247051 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1952660.

The product of its (nonzero) digits is 3920, while the sum is 28.

The square root of 72247051 is about 8499.8265276416. The cubic root of 72247051 is about 416.4920425234.

The spelling of 72247051 in words is "seventy-two million, two hundred forty-seven thousand, fifty-one".