189287280 has 480 divisors, whose sum is σ = 818947584. Its totient is φ = 39564288.

The previous prime is 189287279. The next prime is 189287311. The reversal of 189287280 is 82782981.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 1768987 + ... + 1769093.

Almost surely, 2^189287280 is an apocalyptic number.

189287280 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 189287280, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (409473792).

189287280 is an abundant number, since it is smaller than the sum of its proper divisors (629660304).

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

189287280 is a wasteful number, since it uses less digits than its factorization.

189287280 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 155 (or 137 counting only the distinct ones).

The product of its (nonzero) digits is 129024, while the sum is 45.

The square root of 189287280 is about 13758.1713901230. The cubic root of 189287280 is about 574.1699731746.

The spelling of 189287280 in words is "one hundred eighty-nine million, two hundred eighty-seven thousand, two hundred eighty".