189881577970 has 32 divisors (see below), whose sum is σ = 397234108800. Its totient is φ = 63998825856.

The previous prime is 189881577961. The next prime is 189881577971. The reversal of 189881577970 is 79775188981.

It is a Harshad number since it is a multiple of its sum of digits (70).

It is a self number, because there is not a number n which added to its sum of digits gives 189881577970.

It is not an unprimeable number, because it can be changed into a prime (189881577971) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 22983955 + ... + 22992214.

It is an arithmetic number, because the mean of its divisors is an integer number (12413565900).

Almost surely, 2^189881577970 is an apocalyptic number.

189881577970 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

189881577970 is an abundant number, since it is smaller than the sum of its proper divisors (207352530830).

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

189881577970 is a wasteful number, since it uses less digits than its factorization.

189881577970 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 45976242.

The product of its (nonzero) digits is 71124480, while the sum is 70.

The spelling of 189881577970 in words is "one hundred eighty-nine billion, eight hundred eighty-one million, five hundred seventy-seven thousand, nine hundred seventy".