642220737 has 16 divisors (see below), whose sum is σ = 875626752. Its totient is φ = 418504320.

The previous prime is 642220703. The next prime is 642220739. The reversal of 642220737 is 737022246.

It is not a de Polignac number, because 642220737 - 2¹⁰ = 642219713 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 642220698 and 642220707.

It is not an unprimeable number, because it can be changed into a prime (642220739) 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, 129687 + ... + 134547.

It is an arithmetic number, because the mean of its divisors is an integer number (54726672).

Almost surely, 2^642220737 is an apocalyptic number.

It is an amenable number.

642220737 is a deficient number, since it is larger than the sum of its proper divisors (233406015).

642220737 is a wasteful number, since it uses less digits than its factorization.

642220737 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5848.

The product of its (nonzero) digits is 28224, while the sum is 33.

The square root of 642220737 is about 25342.0744415291. The cubic root of 642220737 is about 862.7694821870.

The spelling of 642220737 in words is "six hundred forty-two million, two hundred twenty thousand, seven hundred thirty-seven".