72423454 has 4 divisors (see below), whose sum is σ = 108635184. Its totient is φ = 36211726.

The previous prime is 72423427. The next prime is 72423457. The reversal of 72423454 is 45432427.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 45432427 = 151 ⋅300877.

It is a Smith number, since the sum of its digits (31) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (72423457) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 18105862 + ... + 18105865.

It is an arithmetic number, because the mean of its divisors is an integer number (27158796).

Almost surely, 2^72423454 is an apocalyptic number.

72423454 is a deficient number, since it is larger than the sum of its proper divisors (36211730).

72423454 is a wasteful number, since it uses less digits than its factorization.

72423454 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 36211729.

The product of its digits is 26880, while the sum is 31.

The square root of 72423454 is about 8510.1970599981. The cubic root of 72423454 is about 416.8307448373.

The spelling of 72423454 in words is "seventy-two million, four hundred twenty-three thousand, four hundred fifty-four".