190488978 has 24 divisors (see below), whose sum is σ = 437004828. Its totient is φ = 59761152.

The previous prime is 190488971. The next prime is 190488989. The reversal of 190488978 is 879884091.

190488978 is a `hidden beast` number, since 1 + 90 + 488 + 9 + 78 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 190357209 + 131769 = 13797^2 + 363^2 .

It is not an unprimeable number, because it can be changed into a prime (190488971) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 310951 + ... + 311562.

Almost surely, 2^190488978 is an apocalyptic number.

190488978 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

190488978 is an abundant number, since it is smaller than the sum of its proper divisors (246515850).

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

190488978 is a wasteful number, since it uses less digits than its factorization.

190488978 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 622538 (or 622535 counting only the distinct ones).

The product of its (nonzero) digits is 1161216, while the sum is 54.

The square root of 190488978 is about 13801.7744511349. The cubic root of 190488978 is about 575.3824580931.

The spelling of 190488978 in words is "one hundred ninety million, four hundred eighty-eight thousand, nine hundred seventy-eight".