642072799 has 2 divisors, whose sum is σ = 642072800. Its totient is φ = 642072798.

The previous prime is 642072797. The next prime is 642072883. The reversal of 642072799 is 997270246.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 642072799 - 2¹ = 642072797 is a prime.

Together with 642072797, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (642072791) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 321036399 + 321036400.

It is an arithmetic number, because the mean of its divisors is an integer number (321036400).

Almost surely, 2^642072799 is an apocalyptic number.

642072799 is a deficient number, since it is larger than the sum of its proper divisors (1).

642072799 is an equidigital number, since it uses as much as digits as its factorization.

642072799 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 381024, while the sum is 46.

The square root of 642072799 is about 25339.1554515931. The cubic root of 642072799 is about 862.7032296842.

The spelling of 642072799 in words is "six hundred forty-two million, seventy-two thousand, seven hundred ninety-nine".