90344578 has 4 divisors (see below), whose sum is σ = 135516870. Its totient is φ = 45172288.

The previous prime is 90344561. The next prime is 90344593. The reversal of 90344578 is 87544309.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 87544309 = 631 ⋅138739.

It can be written as a sum of positive squares in only one way, i.e., 90117049 + 227529 = 9493^2 + 477^2 .

It is a Smith number, since the sum of its digits (40) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a self number, because there is not a number n which added to its sum of digits gives 90344578.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 22586143 + ... + 22586146.

Almost surely, 2^90344578 is an apocalyptic number.

90344578 is a deficient number, since it is larger than the sum of its proper divisors (45172292).

90344578 is a wasteful number, since it uses less digits than its factorization.

90344578 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 45172291.

The product of its (nonzero) digits is 120960, while the sum is 40.

The square root of 90344578 is about 9504.9764860309. The cubic root of 90344578 is about 448.7116698199.

The spelling of 90344578 in words is "ninety million, three hundred forty-four thousand, five hundred seventy-eight".