645427530 has 96 divisors (see below), whose sum is σ = 1927074240. Its totient is φ = 148227840.

The previous prime is 645427507. The next prime is 645427537. The reversal of 645427530 is 35724546.

645427530 is a `hidden beast` number, since 64 + 542 + 7 + 53 + 0 = 666.

It is a hoax number, since the sum of its digits (36) coincides with the sum of the digits of its distinct prime factors.

It is not an unprimeable number, because it can be changed into a prime (645427537) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 1654 + ... + 35966.

It is an arithmetic number, because the mean of its divisors is an integer number (20073690).

Almost surely, 2^645427530 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 645427530, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (963537120).

645427530 is an abundant number, since it is smaller than the sum of its proper divisors (1281646710).

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

645427530 is a wasteful number, since it uses less digits than its factorization.

645427530 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 34356 (or 34353 counting only the distinct ones).

The product of its (nonzero) digits is 100800, while the sum is 36.

The square root of 645427530 is about 25405.2657927446. The cubic root of 645427530 is about 864.2031174332.

The spelling of 645427530 in words is "six hundred forty-five million, four hundred twenty-seven thousand, five hundred thirty".