90724278 has 16 divisors (see below), whose sum is σ = 190998720. Its totient is φ = 28649736.

The previous prime is 90724247. The next prime is 90724279. The reversal of 90724278 is 87242709.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (90724279) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 397800 + ... + 398027.

It is an arithmetic number, because the mean of its divisors is an integer number (11937420).

Almost surely, 2^90724278 is an apocalyptic number.

90724278 is an abundant number, since it is smaller than the sum of its proper divisors (100274442).

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

90724278 is a wasteful number, since it uses less digits than its factorization.

90724278 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 795851.

The product of its (nonzero) digits is 56448, while the sum is 39.

The square root of 90724278 is about 9524.9292910761. The cubic root of 90724278 is about 449.3394060401.

The spelling of 90724278 in words is "ninety million, seven hundred twenty-four thousand, two hundred seventy-eight".