195657690 has 16 divisors (see below), whose sum is σ = 469578528. Its totient is φ = 52175376.

The previous prime is 195657677. The next prime is 195657691. The reversal of 195657690 is 96756591.

It is a super-2 number, since 2×195657690² = 76563863312272200, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (195657691) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3260932 + ... + 3260991.

It is an arithmetic number, because the mean of its divisors is an integer number (29348658).

Almost surely, 2^195657690 is an apocalyptic number.

195657690 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

195657690 is an abundant number, since it is smaller than the sum of its proper divisors (273920838).

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

195657690 is a wasteful number, since it uses less digits than its factorization.

195657690 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6521933.

The product of its (nonzero) digits is 510300, while the sum is 48.

The square root of 195657690 is about 13987.7693003567. The cubic root of 195657690 is about 580.5402121083.

The spelling of 195657690 in words is "one hundred ninety-five million, six hundred fifty-seven thousand, six hundred ninety".