642187038 has 16 divisors (see below), whose sum is σ = 1311701760. Its totient is φ = 209507736.

The previous prime is 642187037. The next prime is 642187081. The reversal of 642187038 is 830781246.

It is a junction number, because it is equal to n+sod(n) for n = 642186987 and 642187005.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (642187033) 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, 1138348 + ... + 1138911.

It is an arithmetic number, because the mean of its divisors is an integer number (81981360).

Almost surely, 2^642187038 is an apocalyptic number.

642187038 is an abundant number, since it is smaller than the sum of its proper divisors (669514722).

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

642187038 is a wasteful number, since it uses less digits than its factorization.

642187038 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2277311.

The product of its (nonzero) digits is 64512, while the sum is 39.

The square root of 642187038 is about 25341.4095503782. The cubic root of 642187038 is about 862.7543913334.

The spelling of 642187038 in words is "six hundred forty-two million, one hundred eighty-seven thousand, thirty-eight".