90878613 has 8 divisors (see below), whose sum is σ = 138481728. Its totient is φ = 51930624.

The previous prime is 90878597. The next prime is 90878633. The reversal of 90878613 is 31687809.

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

It is not a de Polignac number, because 90878613 - 2⁴ = 90878597 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (90878633) 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, 2163756 + ... + 2163797.

It is an arithmetic number, because the mean of its divisors is an integer number (17310216).

Almost surely, 2^90878613 is an apocalyptic number.

It is an amenable number.

90878613 is a deficient number, since it is larger than the sum of its proper divisors (47603115).

90878613 is a wasteful number, since it uses less digits than its factorization.

90878613 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4327563.

The product of its (nonzero) digits is 72576, while the sum is 42.

The square root of 90878613 is about 9533.0274834388. The cubic root of 90878613 is about 449.5940586050.

The spelling of 90878613 in words is "ninety million, eight hundred seventy-eight thousand, six hundred thirteen".