642561962 has 8 divisors (see below), whose sum is σ = 1101534816. Its totient is φ = 275383692.

The previous prime is 642561949. The next prime is 642561967. The reversal of 642561962 is 269165246.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not an unprimeable number, because it can be changed into a prime (642561967) 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, 22948628 + ... + 22948655.

It is an arithmetic number, because the mean of its divisors is an integer number (137691852).

Almost surely, 2^642561962 is an apocalyptic number.

642561962 is a deficient number, since it is larger than the sum of its proper divisors (458972854).

642561962 is a wasteful number, since it uses less digits than its factorization.

642561962 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 45897292.

The product of its digits is 155520, while the sum is 41.

The square root of 642561962 is about 25348.8059284851. The cubic root of 642561962 is about 862.9222574842.

The spelling of 642561962 in words is "six hundred forty-two million, five hundred sixty-one thousand, nine hundred sixty-two".