189699678 has 48 divisors (see below), whose sum is σ = 490386960. Its totient is φ = 54199152.

The previous prime is 189699637. The next prime is 189699683. The reversal of 189699678 is 876996981.

It is a Harshad number since it is a multiple of its sum of digits (63).

It is a Curzon number.

It is a congruent 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, 33201 + ... + 38492.

It is an arithmetic number, because the mean of its divisors is an integer number (10216395).

Almost surely, 2^189699678 is an apocalyptic number.

189699678 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

189699678 is an abundant number, since it is smaller than the sum of its proper divisors (300687282).

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

189699678 is a wasteful number, since it uses less digits than its factorization.

189699678 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 71718 (or 71705 counting only the distinct ones).

The product of its digits is 11757312, while the sum is 63.

The square root of 189699678 is about 13773.1506199562. The cubic root of 189699678 is about 574.5866498702.

The spelling of 189699678 in words is "one hundred eighty-nine million, six hundred ninety-nine thousand, six hundred seventy-eight".