72971453 has 4 divisors (see below), whose sum is σ = 75487740. Its totient is φ = 70455168.

The previous prime is 72971443. The next prime is 72971461. The reversal of 72971453 is 35417927.

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

It can be written as a sum of positive squares in 2 ways, for example, as 16826404 + 56145049 = 4102^2 + 7493^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-72971453 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 (72971413) 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, 1258100 + ... + 1258157.

It is an arithmetic number, because the mean of its divisors is an integer number (18871935).

Almost surely, 2^72971453 is an apocalyptic number.

It is an amenable number.

72971453 is a deficient number, since it is larger than the sum of its proper divisors (2516287).

72971453 is a wasteful number, since it uses less digits than its factorization.

72971453 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2516286.

The product of its digits is 52920, while the sum is 38.

The square root of 72971453 is about 8542.3329951483. The cubic root of 72971453 is about 417.8794341809.

The spelling of 72971453 in words is "seventy-two million, nine hundred seventy-one thousand, four hundred fifty-three".