645620360 has 128 divisors (see below), whose sum is σ = 1830608640. Its totient is φ = 199065600.

The previous prime is 645620351. The next prime is 645620411. The reversal of 645620360 is 63026546.

645620360 = T₃₄₄ + T₃₄₅ + ... + T₁₅₇₅.

It is a super-3 number, since 3×645620360³ (a number of 27 digits) contains 333 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 297680 + ... + 299840.

It is an arithmetic number, because the mean of its divisors is an integer number (14301630).

Almost surely, 2^645620360 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 645620360, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (915304320).

645620360 is an abundant number, since it is smaller than the sum of its proper divisors (1184988280).

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

645620360 is a wasteful number, since it uses less digits than its factorization.

645620360 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2287 (or 2283 counting only the distinct ones).

The product of its (nonzero) digits is 25920, while the sum is 32.

The square root of 645620360 is about 25409.0605886955. The cubic root of 645620360 is about 864.2891728959.

The spelling of 645620360 in words is "six hundred forty-five million, six hundred twenty thousand, three hundred sixty".