90878565 has 16 divisors (see below), whose sum is σ = 148788288. Its totient is φ = 47341056.

The previous prime is 90878537. The next prime is 90878587. The reversal of 90878565 is 56587809.

It is not a de Polignac number, because 90878565 - 2¹⁰ = 90877541 is a prime.

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, 69804 + ... + 71093.

It is an arithmetic number, because the mean of its divisors is an integer number (9299268).

Almost surely, 2^90878565 is an apocalyptic number.

It is an amenable number.

90878565 is a deficient number, since it is larger than the sum of its proper divisors (57909723).

90878565 is a wasteful number, since it uses less digits than its factorization.

90878565 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 140948.

The product of its (nonzero) digits is 604800, while the sum is 48.

The square root of 90878565 is about 9533.0249658752. The cubic root of 90878565 is about 449.5939794499.

The spelling of 90878565 in words is "ninety million, eight hundred seventy-eight thousand, five hundred sixty-five".