189890900640 has 192 divisors, whose sum is σ = 759563723520. Its totient is φ = 43403627520.

The previous prime is 189890900579. The next prime is 189890900653. The reversal of 189890900640 is 46009098981.

It is a Harshad number since it is a multiple of its sum of digits (54).

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 3109491 + ... + 3169970.

It is an arithmetic number, because the mean of its divisors is an integer number (3956061060).

Almost surely, 2^189890900640 is an apocalyptic number.

189890900640 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

189890900640 is an abundant number, since it is smaller than the sum of its proper divisors (569672822880).

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

189890900640 is a wasteful number, since it uses less digits than its factorization.

189890900640 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6279492 (or 6279478 counting only the distinct ones).

The product of its (nonzero) digits is 1119744, while the sum is 54.

The spelling of 189890900640 in words is "one hundred eighty-nine billion, eight hundred ninety million, nine hundred thousand, six hundred forty".