645061092 has 96 divisors (see below), whose sum is σ = 1679892480. Its totient is φ = 191393280.

The previous prime is 645061091. The next prime is 645061093. The reversal of 645061092 is 290160546.

It is an interprime number because it is at equal distance from previous prime (645061091) and next prime (645061093).

It is a super-2 number, since 2×645061092² = 832207624824464928, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (645061091) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 503709 + ... + 504987.

It is an arithmetic number, because the mean of its divisors is an integer number (17498880).

Almost surely, 2^645061092 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 645061092, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (839946240).

645061092 is an abundant number, since it is smaller than the sum of its proper divisors (1034831388).

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

645061092 is a wasteful number, since it uses less digits than its factorization.

645061092 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1413 (or 1411 counting only the distinct ones).

The product of its (nonzero) digits is 12960, while the sum is 33.

The square root of 645061092 is about 25398.0529174974. The cubic root of 645061092 is about 864.0395375854.

The spelling of 645061092 in words is "six hundred forty-five million, sixty-one thousand, ninety-two".