642226536 has 96 divisors (see below), whose sum is σ = 2075256000. Its totient is φ = 183490272.

The previous prime is 642226513. The next prime is 642226537. The reversal of 642226536 is 635622246.

642226536 is a `hidden beast` number, since 642 + 2 + 2 + 6 + 5 + 3 + 6 = 666.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a self number, because there is not a number n which added to its sum of digits gives 642226536.

It is not an unprimeable number, because it can be changed into a prime (642226537) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 19756 + ... + 40923.

It is an arithmetic number, because the mean of its divisors is an integer number (21617250).

Almost surely, 2^642226536 is an apocalyptic number.

It is an amenable number.

642226536 is an abundant number, since it is smaller than the sum of its proper divisors (1433029464).

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

642226536 is a wasteful number, since it uses less digits than its factorization.

642226536 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 60708 (or 60691 counting only the distinct ones).

The product of its digits is 103680, while the sum is 36.

The square root of 642226536 is about 25342.1888557401. The cubic root of 642226536 is about 862.7720790019.

The spelling of 642226536 in words is "six hundred forty-two million, two hundred twenty-six thousand, five hundred thirty-six".