186064640 has 72 divisors (see below), whose sum is σ = 453179328. Its totient is φ = 73175040.

The previous prime is 186064639. The next prime is 186064651. The reversal of 186064640 is 46460681.

It is a self number, because there is not a number n which added to its sum of digits gives 186064640.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 76889 + ... + 79271.

Almost surely, 2^186064640 is an apocalyptic number.

186064640 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 186064640, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (226589664).

186064640 is an abundant number, since it is smaller than the sum of its proper divisors (267114688).

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

186064640 is an equidigital number, since it uses as much as digits as its factorization.

186064640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2465 (or 2451 counting only the distinct ones).

The product of its (nonzero) digits is 27648, while the sum is 35.

The square root of 186064640 is about 13640.5513085066. The cubic root of 186064640 is about 570.8928655596.

The spelling of 186064640 in words is "one hundred eighty-six million, sixty-four thousand, six hundred forty".