90840478 has 16 divisors (see below), whose sum is σ = 146774016. Its totient is φ = 42043320.

The previous prime is 90840473. The next prime is 90840479. The reversal of 90840478 is 87404809.

It is a self number, because there is not a number n which added to its sum of digits gives 90840478.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (90840473) 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, 30426 + ... + 33277.

It is an arithmetic number, because the mean of its divisors is an integer number (9173376).

Almost surely, 2^90840478 is an apocalyptic number.

90840478 is a deficient number, since it is larger than the sum of its proper divisors (55933538).

90840478 is a wasteful number, since it uses less digits than its factorization.

90840478 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 63759.

The product of its (nonzero) digits is 64512, while the sum is 40.

The square root of 90840478 is about 9531.0271219843. The cubic root of 90840478 is about 449.5311627354.

The spelling of 90840478 in words is "ninety million, eight hundred forty thousand, four hundred seventy-eight".