72154478 has 12 divisors (see below), whose sum is σ = 118965840. Its totient is φ = 32797380.

The previous prime is 72154471. The next prime is 72154493. The reversal of 72154478 is 87445127.

It is a hoax number, since the sum of its digits (38) coincides with the sum of the digits of its distinct prime factors.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (72154471) 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, 148838 + ... + 149321.

It is an arithmetic number, because the mean of its divisors is an integer number (9913820).

Almost surely, 2^72154478 is an apocalyptic number.

72154478 is a deficient number, since it is larger than the sum of its proper divisors (46811362).

72154478 is a wasteful number, since it uses less digits than its factorization.

72154478 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 298183 (or 298172 counting only the distinct ones).

The product of its digits is 62720, while the sum is 38.

The square root of 72154478 is about 8494.3792003889. The cubic root of 72154478 is about 416.3140772556.

The spelling of 72154478 in words is "seventy-two million, one hundred fifty-four thousand, four hundred seventy-eight".