206715090 has 16 divisors (see below), whose sum is σ = 496116288. Its totient is φ = 55124016.

The previous prime is 206715083. The next prime is 206715137. The reversal of 206715090 is 90517602.

It is a super-2 number, since 2×206715090² = 85462256867416200, which contains 22 as substring.

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: 6890503 = 206715090 / (2 + 0 + 6 + 7 + 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, 3445222 + ... + 3445281.

It is an arithmetic number, because the mean of its divisors is an integer number (31007268).

Almost surely, 2^206715090 is an apocalyptic number.

206715090 is an abundant number, since it is smaller than the sum of its proper divisors (289401198).

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

206715090 is a wasteful number, since it uses less digits than its factorization.

206715090 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6890513.

The product of its (nonzero) digits is 3780, while the sum is 30.

The square root of 206715090 is about 14377.5898536577. The cubic root of 206715090 is about 591.2766476316.

The spelling of 206715090 in words is "two hundred six million, seven hundred fifteen thousand, ninety".