190878681 has 8 divisors (see below), whose sum is σ = 290862784. Its totient is φ = 109073520.

The previous prime is 190878661. The next prime is 190878683. The reversal of 190878681 is 186878091.

190878681 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 190878681 - 2²⁵ = 157324249 is a prime.

It is a super-2 number, since 2×190878681² = 72869341720599522, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 190878681.

It is not an unprimeable number, because it can be changed into a prime (190878683) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4544710 + ... + 4544751.

It is an arithmetic number, because the mean of its divisors is an integer number (36357848).

Almost surely, 2^190878681 is an apocalyptic number.

It is an amenable number.

190878681 is a deficient number, since it is larger than the sum of its proper divisors (99984103).

190878681 is an equidigital number, since it uses as much as digits as its factorization.

190878681 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9089471.

The product of its (nonzero) digits is 193536, while the sum is 48.

The square root of 190878681 is about 13815.8850965112. The cubic root of 190878681 is about 575.7745639549.

The spelling of 190878681 in words is "one hundred ninety million, eight hundred seventy-eight thousand, six hundred eighty-one".