90415865 has 8 divisors (see below), whose sum is σ = 111145608. Its totient is φ = 70568320.

The previous prime is 90415861. The next prime is 90415879. The reversal of 90415865 is 56851409.

It can be written as a sum of positive squares in 4 ways, for example, as 10778089 + 79637776 = 3283^2 + 8924^2 .

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

It is not a de Polignac number, because 90415865 - 2² = 90415861 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (90415861) 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, 220322 + ... + 220731.

It is an arithmetic number, because the mean of its divisors is an integer number (13893201).

Almost surely, 2^90415865 is an apocalyptic number.

It is an amenable number.

90415865 is a deficient number, since it is larger than the sum of its proper divisors (20729743).

90415865 is a wasteful number, since it uses less digits than its factorization.

90415865 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 441099.

The product of its (nonzero) digits is 43200, while the sum is 38.

The square root of 90415865 is about 9508.7257295602. The cubic root of 90415865 is about 448.8296584509.

The spelling of 90415865 in words is "ninety million, four hundred fifteen thousand, eight hundred sixty-five".