90918815 has 16 divisors (see below), whose sum is σ = 121287936. Its totient is φ = 64972800.

The previous prime is 90918811. The next prime is 90918827. The reversal of 90918815 is 51881909.

It is not a de Polignac number, because 90918815 - 2² = 90918811 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (90918811) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 20546 + ... + 24575.

It is an arithmetic number, because the mean of its divisors is an integer number (7580496).

Almost surely, 2^90918815 is an apocalyptic number.

90918815 is a deficient number, since it is larger than the sum of its proper divisors (30369121).

90918815 is a wasteful number, since it uses less digits than its factorization.

90918815 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 45170.

The product of its (nonzero) digits is 25920, while the sum is 41.

The square root of 90918815 is about 9535.1358144496. The cubic root of 90918815 is about 449.6603445190.

The spelling of 90918815 in words is "ninety million, nine hundred eighteen thousand, eight hundred fifteen".