90815049 has 24 divisors (see below), whose sum is σ = 142538760. Its totient is φ = 55383552.

The previous prime is 90815009. The next prime is 90815069. The reversal of 90815049 is 94051809.

It can be written as a sum of positive squares in 4 ways, for example, as 18020025 + 72795024 = 4245^2 + 8532^2 .

It is not a de Polignac number, because 90815049 - 2¹⁵ = 90782281 is a prime.

It is not an unprimeable number, because it can be changed into a prime (90815009) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 9787 + ... + 16655.

It is an arithmetic number, because the mean of its divisors is an integer number (5939115).

Almost surely, 2^90815049 is an apocalyptic number.

It is an amenable number.

90815049 is a deficient number, since it is larger than the sum of its proper divisors (51723711).

90815049 is a wasteful number, since it uses less digits than its factorization.

90815049 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7001 (or 6998 counting only the distinct ones).

The product of its (nonzero) digits is 12960, while the sum is 36.

The square root of 90815049 is about 9529.6930170914. The cubic root of 90815049 is about 449.4892130268.

The spelling of 90815049 in words is "ninety million, eight hundred fifteen thousand, forty-nine".