645842652 has 48 divisors (see below), whose sum is σ = 1854730752. Its totient is φ = 170331840.

The previous prime is 645842647. The next prime is 645842657. The reversal of 645842652 is 256248546.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (645842647) and next prime (645842657).

It is a super-2 number, since 2×645842652² = 834225462284786208, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (42).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (645842657) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 294624 + ... + 296807.

It is an arithmetic number, because the mean of its divisors is an integer number (38640224).

Almost surely, 2^645842652 is an apocalyptic number.

It is an amenable number.

645842652 is an abundant number, since it is smaller than the sum of its proper divisors (1208888100).

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

645842652 is a wasteful number, since it uses less digits than its factorization.

645842652 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 591458 (or 591456 counting only the distinct ones).

The product of its digits is 460800, while the sum is 42.

The square root of 645842652 is about 25413.4344786375. The cubic root of 645842652 is about 864.3883552921.

The spelling of 645842652 in words is "six hundred forty-five million, eight hundred forty-two thousand, six hundred fifty-two".