72166454 has 4 divisors (see below), whose sum is σ = 108249684. Its totient is φ = 36083226.

The previous prime is 72166453. The next prime is 72166469. The reversal of 72166454 is 45466127.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (72166453) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 18041612 + ... + 18041615.

It is an arithmetic number, because the mean of its divisors is an integer number (27062421).

Almost surely, 2^72166454 is an apocalyptic number.

72166454 is a deficient number, since it is larger than the sum of its proper divisors (36083230).

72166454 is a wasteful number, since it uses less digits than its factorization.

72166454 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 36083229.

The product of its digits is 40320, while the sum is 35.

The square root of 72166454 is about 8495.0841078826. The cubic root of 72166454 is about 416.3371088665.

The spelling of 72166454 in words is "seventy-two million, one hundred sixty-six thousand, four hundred fifty-four".