90878544 has 80 divisors (see below), whose sum is σ = 262354240. Its totient is φ = 30119040.

The previous prime is 90878537. The next prime is 90878587. The reversal of 90878544 is 44587809.

It is a self number, because there is not a number n which added to its sum of digits gives 90878544.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 90654 + ... + 91650.

It is an arithmetic number, because the mean of its divisors is an integer number (3279428).

Almost surely, 2^90878544 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 90878544, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (131177120).

90878544 is an abundant number, since it is smaller than the sum of its proper divisors (171475696).

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

90878544 is a wasteful number, since it uses less digits than its factorization.

90878544 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1225 (or 1213 counting only the distinct ones).

The product of its (nonzero) digits is 322560, while the sum is 45.

The square root of 90878544 is about 9533.0238644409. The cubic root of 90878544 is about 449.5939448195.

The spelling of 90878544 in words is "ninety million, eight hundred seventy-eight thousand, five hundred forty-four".