645276894 has 8 divisors (see below), whose sum is σ = 1290553800. Its totient is φ = 215092296.

The previous prime is 645276889. The next prime is 645276899. The reversal of 645276894 is 498672546.

It is an interprime number because it is at equal distance from previous prime (645276889) and next prime (645276899).

It is a sphenic number, since it is the product of 3 distinct primes.

645276894 is an admirable number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (645276899) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 53773069 + ... + 53773080.

It is an arithmetic number, because the mean of its divisors is an integer number (161319225).

Almost surely, 2^645276894 is an apocalyptic number.

645276894 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

645276894 is a wasteful number, since it uses less digits than its factorization.

645276894 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 107546154.

The product of its digits is 2903040, while the sum is 51.

The square root of 645276894 is about 25402.3009587714. The cubic root of 645276894 is about 864.1358802281.

The spelling of 645276894 in words is "six hundred forty-five million, two hundred seventy-six thousand, eight hundred ninety-four".