72493021 has 4 divisors (see below), whose sum is σ = 72550044. Its totient is φ = 72436000.

The previous prime is 72493013. The next prime is 72493061. The reversal of 72493021 is 12039427.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 12039427 = 53 ⋅227159.

It can be written as a sum of positive squares in 2 ways, for example, as 36132121 + 36360900 = 6011^2 + 6030^2 .

It is a cyclic number.

It is not a de Polignac number, because 72493021 - 2³ = 72493013 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 (72493061) 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, 26560 + ... + 29161.

It is an arithmetic number, because the mean of its divisors is an integer number (18137511).

Almost surely, 2^72493021 is an apocalyptic number.

It is an amenable number.

72493021 is a deficient number, since it is larger than the sum of its proper divisors (57023).

72493021 is a wasteful number, since it uses less digits than its factorization.

72493021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 57022.

The product of its (nonzero) digits is 3024, while the sum is 28.

The square root of 72493021 is about 8514.2833521090. The cubic root of 72493021 is about 416.9641656337.

The spelling of 72493021 in words is "seventy-two million, four hundred ninety-three thousand, twenty-one".