642937782 has 16 divisors (see below), whose sum is σ = 1295692992. Its totient is φ = 212676360.

The previous prime is 642937781. The next prime is 642937793. The reversal of 642937782 is 287739246.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (642937781) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 408208 + ... + 409779.

It is an arithmetic number, because the mean of its divisors is an integer number (80980812).

Almost surely, 2^642937782 is an apocalyptic number.

642937782 is an abundant number, since it is smaller than the sum of its proper divisors (652755210).

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

642937782 is a wasteful number, since it uses less digits than its factorization.

642937782 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 818123.

The product of its digits is 1016064, while the sum is 48.

The square root of 642937782 is about 25356.2178173323. The cubic root of 642937782 is about 863.0904592850.

The spelling of 642937782 in words is "six hundred forty-two million, nine hundred thirty-seven thousand, seven hundred eighty-two".