645237030 has 32 divisors (see below), whose sum is σ = 1558443744. Its totient is φ = 170966016.

The previous prime is 645237029. The next prime is 645237053. The reversal of 645237030 is 30732546.

It is a Harshad number since it is a multiple of its sum of digits (30).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 63787 + ... + 73206.

It is an arithmetic number, because the mean of its divisors is an integer number (48701367).

Almost surely, 2^645237030 is an apocalyptic number.

645237030 is an abundant number, since it is smaller than the sum of its proper divisors (913206714).

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

645237030 is a wasteful number, since it uses less digits than its factorization.

645237030 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 137160.

The product of its (nonzero) digits is 15120, while the sum is 30.

The square root of 645237030 is about 25401.5162933239. The cubic root of 645237030 is about 864.1180849620.

Adding to 645237030 its reverse (30732546), we get a palindrome (675969576).

The spelling of 645237030 in words is "six hundred forty-five million, two hundred thirty-seven thousand, thirty".