620631239 has 4 divisors (see below), whose sum is σ = 621331824. Its totient is φ = 619930656.

The previous prime is 620631211. The next prime is 620631269. The reversal of 620631239 is 932136026.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-620631239 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (620631269) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 348962 + ... + 350735.

It is an arithmetic number, because the mean of its divisors is an integer number (155332956).

Almost surely, 2^620631239 is an apocalyptic number.

620631239 is a deficient number, since it is larger than the sum of its proper divisors (700585).

620631239 is an equidigital number, since it uses as much as digits as its factorization.

620631239 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 700584.

The product of its (nonzero) digits is 11664, while the sum is 32.

The square root of 620631239 is about 24912.4715554278. The cubic root of 620631239 is about 852.9911865673.

The spelling of 620631239 in words is "six hundred twenty million, six hundred thirty-one thousand, two hundred thirty-nine".