190491887850 has 48 divisors (see below), whose sum is σ = 515367148320. Its totient is φ = 46179851200.

The previous prime is 190491887809. The next prime is 190491887869. The reversal of 190491887850 is 58788194091.

It is a happy number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 57723165 + ... + 57726464.

It is an arithmetic number, because the mean of its divisors is an integer number (10736815590).

Almost surely, 2^190491887850 is an apocalyptic number.

190491887850 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

190491887850 is an abundant number, since it is smaller than the sum of its proper divisors (324875260470).

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

190491887850 is a wasteful number, since it uses less digits than its factorization.

190491887850 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 115449655 (or 115449650 counting only the distinct ones).

The product of its (nonzero) digits is 5806080, while the sum is 60.

The spelling of 190491887850 in words is "one hundred ninety billion, four hundred ninety-one million, eight hundred eighty-seven thousand, eight hundred fifty".