642321036 has 96 divisors (see below), whose sum is σ = 1954695680. Its totient is φ = 178552512.

The previous prime is 642321019. The next prime is 642321077. The reversal of 642321036 is 630123246.

642321036 is a `hidden beast` number, since 642 + 3 + 2 + 10 + 3 + 6 = 666.

It is a super-2 number, since 2×642321036² = 825152626576226592, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 16491 + ... + 39453.

Almost surely, 2^642321036 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 642321036, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (977347840).

642321036 is an abundant number, since it is smaller than the sum of its proper divisors (1312374644).

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

642321036 is a wasteful number, since it uses less digits than its factorization.

642321036 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 23020 (or 23012 counting only the distinct ones).

The product of its (nonzero) digits is 5184, while the sum is 27.

The square root of 642321036 is about 25344.0532669895. The cubic root of 642321036 is about 862.8143942693.

It can be divided in two parts, 6423210 and 36, that added together give a palindrome (6423246).

The spelling of 642321036 in words is "six hundred forty-two million, three hundred twenty-one thousand, thirty-six".