645336090 has 96 divisors (see below), whose sum is σ = 1921570560. Its totient is φ = 147197952.

The previous prime is 645336067. The next prime is 645336113. The reversal of 645336090 is 90633546.

645336090 is a `hidden beast` number, since 6 + 45 + 3 + 3 + 609 + 0 = 666.

It is an interprime number because it is at equal distance from previous prime (645336067) and next prime (645336113).

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 457306 + ... + 458714.

It is an arithmetic number, because the mean of its divisors is an integer number (20016360).

Almost surely, 2^645336090 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 645336090, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (960785280).

645336090 is an abundant number, since it is smaller than the sum of its proper divisors (1276234470).

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

645336090 is a wasteful number, since it uses less digits than its factorization.

645336090 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2156 (or 2153 counting only the distinct ones).

The product of its (nonzero) digits is 58320, while the sum is 36.

The square root of 645336090 is about 25403.4661020893. The cubic root of 645336090 is about 864.1623039354.

The spelling of 645336090 in words is "six hundred forty-five million, three hundred thirty-six thousand, ninety".