72154919 has 6 divisors (see below), whose sum is σ = 76649304. Its totient is φ = 67910240.

The previous prime is 72154891. The next prime is 72154937. The reversal of 72154919 is 91945127.

It is a de Polignac number, because none of the positive numbers 2^k-72154919 is a prime.

It is a super-2 number, since 2×72154919² = 10412664671793122, 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 (72114919) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 124547 + ... + 125124.

It is an arithmetic number, because the mean of its divisors is an integer number (12774884).

Almost surely, 2^72154919 is an apocalyptic number.

72154919 is a deficient number, since it is larger than the sum of its proper divisors (4494385).

72154919 is a wasteful number, since it uses less digits than its factorization.

72154919 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 249705 (or 249688 counting only the distinct ones).

The product of its digits is 22680, while the sum is 38.

The square root of 72154919 is about 8494.4051586912. The cubic root of 72154919 is about 416.3149254087.

The spelling of 72154919 in words is "seventy-two million, one hundred fifty-four thousand, nine hundred nineteen".