72293478 has 32 divisors (see below), whose sum is σ = 147474432. Its totient is φ = 23620800.

The previous prime is 72293471. The next prime is 72293489. The reversal of 72293478 is 87439227.

It is a super-2 number, since 2×72293478² = 10452693922672968, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (72293471) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 94618 + ... + 95378.

It is an arithmetic number, because the mean of its divisors is an integer number (4608576).

Almost surely, 2^72293478 is an apocalyptic number.

72293478 is an abundant number, since it is smaller than the sum of its proper divisors (75180954).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

72293478 is a wasteful number, since it uses less digits than its factorization.

72293478 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1060.

The product of its digits is 169344, while the sum is 42.

The square root of 72293478 is about 8502.5571447653. The cubic root of 72293478 is about 416.5812380236.

It can be divided in two parts, 72293 and 478, that added together give a triangular number (72771 = T₃₈₁).

The spelling of 72293478 in words is "seventy-two million, two hundred ninety-three thousand, four hundred seventy-eight".