90855815 has 8 divisors (see below), whose sum is σ = 114765360. Its totient is φ = 68859072.

The previous prime is 90855781. The next prime is 90855827. The reversal of 90855815 is 51855809.

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

It is a cyclic number.

It is not a de Polignac number, because 90855815 - 2¹⁰ = 90854791 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 478094 + ... + 478283.

It is an arithmetic number, because the mean of its divisors is an integer number (14345670).

Almost surely, 2^90855815 is an apocalyptic number.

90855815 is a gapful number since it is divisible by the number (95) formed by its first and last digit.

90855815 is a deficient number, since it is larger than the sum of its proper divisors (23909545).

90855815 is a wasteful number, since it uses less digits than its factorization.

90855815 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 956401.

The product of its (nonzero) digits is 72000, while the sum is 41.

The square root of 90855815 is about 9531.8316707756. The cubic root of 90855815 is about 449.5564600904.

The spelling of 90855815 in words is "ninety million, eight hundred fifty-five thousand, eight hundred fifteen".