72310453 has 4 divisors (see below), whose sum is σ = 73123020. Its totient is φ = 71497888.

The previous prime is 72310417. The next prime is 72310457. The reversal of 72310453 is 35401327.

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 50098084 + 22212369 = 7078^2 + 4713^2 .

It is a cyclic number.

It is not a de Polignac number, because 72310453 - 2²¹ = 70213301 is a prime.

It is a super-2 number, since 2×72310453² = 10457603226130418, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (72310457) 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, 406150 + ... + 406327.

It is an arithmetic number, because the mean of its divisors is an integer number (18280755).

Almost surely, 2^72310453 is an apocalyptic number.

It is an amenable number.

72310453 is a deficient number, since it is larger than the sum of its proper divisors (812567).

72310453 is an equidigital number, since it uses as much as digits as its factorization.

72310453 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 812566.

The product of its (nonzero) digits is 2520, while the sum is 25.

The square root of 72310453 is about 8503.5553152784. Note that the first 3 decimals coincide. The cubic root of 72310453 is about 416.6138408407.

The spelling of 72310453 in words is "seventy-two million, three hundred ten thousand, four hundred fifty-three".