642734356 has 48 divisors (see below), whose sum is σ = 1347816960. Its totient is φ = 264733920.

The previous prime is 642734303. The next prime is 642734357. The reversal of 642734356 is 653437246.

It is a Smith number, since the sum of its digits (40) coincides with the sum of the digits of its prime factors.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (642734357) 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, 2515 + ... + 35941.

It is an arithmetic number, because the mean of its divisors is an integer number (28079520).

Almost surely, 2^642734356 is an apocalyptic number.

It is an amenable number.

642734356 is an abundant number, since it is smaller than the sum of its proper divisors (705082604).

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

642734356 is a wasteful number, since it uses less digits than its factorization.

642734356 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 33484 (or 33482 counting only the distinct ones).

The product of its digits is 362880, while the sum is 40.

The square root of 642734356 is about 25352.2061367448. The cubic root of 642734356 is about 862.9994221918. Note that the first 3 decimals are identical.

The spelling of 642734356 in words is "six hundred forty-two million, seven hundred thirty-four thousand, three hundred fifty-six".