208051690 has 64 divisors (see below), whose sum is σ = 470147328. Its totient is φ = 64396800.

The previous prime is 208051687. The next prime is 208051741. The reversal of 208051690 is 96150802.

It is a super-2 number, since 2×208051690² = 86571011423712200, which contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 120030 + ... + 121750.

It is an arithmetic number, because the mean of its divisors is an integer number (7346052).

Almost surely, 2^208051690 is an apocalyptic number.

208051690 is an abundant number, since it is smaller than the sum of its proper divisors (262095638).

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

208051690 is a wasteful number, since it uses less digits than its factorization.

208051690 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1903.

The product of its (nonzero) digits is 4320, while the sum is 31.

The square root of 208051690 is about 14423.9970188572. The cubic root of 208051690 is about 592.5482902003.

The spelling of 208051690 in words is "two hundred eight million, fifty-one thousand, six hundred ninety".