645406086 has 16 divisors (see below), whose sum is σ = 1390105584. Its totient is φ = 198586464.

The previous prime is 645406061. The next prime is 645406123. The reversal of 645406086 is 680604546.

It is a Harshad number since it is a multiple of its sum of digits (39).

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, 4137141 + ... + 4137296.

It is an arithmetic number, because the mean of its divisors is an integer number (86881599).

Almost surely, 2^645406086 is an apocalyptic number.

645406086 is an abundant number, since it is smaller than the sum of its proper divisors (744699498).

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

645406086 is a wasteful number, since it uses less digits than its factorization.

645406086 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8274455.

The product of its (nonzero) digits is 138240, while the sum is 39.

The square root of 645406086 is about 25404.8437507496. The cubic root of 645406086 is about 864.1935464248.

The spelling of 645406086 in words is "six hundred forty-five million, four hundred six thousand, eighty-six".