642428682 has 24 divisors (see below), whose sum is σ = 1468783968. Its totient is φ = 183504120.

The previous prime is 642428653. The next prime is 642428687. The reversal of 642428682 is 286824246.

It is a super-2 number, since 2×642428682² = 825429222912514248, which contains 22 as substring.

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

It is not an unprimeable number, because it can be changed into a prime (642428687) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 162307 + ... + 166217.

It is an arithmetic number, because the mean of its divisors is an integer number (61199332).

Almost surely, 2^642428682 is an apocalyptic number.

642428682 is an abundant number, since it is smaller than the sum of its proper divisors (826355286).

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

642428682 is an frugal number, since it uses more digits than its factorization.

642428682 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7834 (or 3923 counting only the distinct ones).

The product of its digits is 294912, while the sum is 42.

The square root of 642428682 is about 25346.1768714731. The cubic root of 642428682 is about 862.8625910043.

Multiplying 642428682 by its sum of digits (42), we get a square (26982004644 = 164262²).

642428682 divided by its sum of digits (42) gives a square (15295921 = 3911²).

The spelling of 642428682 in words is "six hundred forty-two million, four hundred twenty-eight thousand, six hundred eighty-two".