16815090 has 16 divisors (see below), whose sum is σ = 40356288. Its totient is φ = 4484016.

The previous prime is 16815079. The next prime is 16815109. The reversal of 16815090 is 9051861.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (30), and also a Moran number because the ratio is a prime number: 560503 = 16815090 / (1 + 6 + 8 + 1 + 5 + 0 + 9 + 0).

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, 280222 + ... + 280281.

It is an arithmetic number, because the mean of its divisors is an integer number (2522268).

Almost surely, 2^16815090 is an apocalyptic number.

16815090 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

16815090 is an abundant number, since it is smaller than the sum of its proper divisors (23541198).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

16815090 is a wasteful number, since it uses less digits than its factorization.

16815090 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 560513.

The product of its (nonzero) digits is 2160, while the sum is 30.

The square root of 16815090 is about 4100.6206847257. The cubic root of 16815090 is about 256.1924923499.

The spelling of 16815090 in words is "sixteen million, eight hundred fifteen thousand, ninety".