90123478 has 8 divisors (see below), whose sum is σ = 135228168. Its totient is φ = 45047424.

The previous prime is 90123463. The next prime is 90123491. The reversal of 90123478 is 87432109.

It is a sphenic number, since it is the product of 3 distinct primes.

It is an alternating number because its digits alternate between odd and even.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4525 + ... + 14167.

It is an arithmetic number, because the mean of its divisors is an integer number (16903521).

Almost surely, 2^90123478 is an apocalyptic number.

90123478 is a deficient number, since it is larger than the sum of its proper divisors (45104690).

90123478 is a wasteful number, since it uses less digits than its factorization.

90123478 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14318.

The product of its (nonzero) digits is 12096, while the sum is 34.

The square root of 90123478 is about 9493.3386118899. The cubic root of 90123478 is about 448.3453272574.

It can be divided in two parts, 90123 and 478, that added together give a square (90601 = 301²).

The spelling of 90123478 in words is "ninety million, one hundred twenty-three thousand, four hundred seventy-eight".