642020620 has 24 divisors (see below), whose sum is σ = 1406863584. Its totient is φ = 245642496.

The previous prime is 642020591. The next prime is 642020627. The reversal of 642020620 is 26020246.

It is a happy number.

It is a junction number, because it is equal to n+sod(n) for n = 642020591 and 642020600.

It is not an unprimeable number, because it can be changed into a prime (642020627) 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, 697389 + ... + 698308.

It is an arithmetic number, because the mean of its divisors is an integer number (58619316).

Almost surely, 2^642020620 is an apocalyptic number.

It is an amenable number.

642020620 is an abundant number, since it is smaller than the sum of its proper divisors (764842964).

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

642020620 is a wasteful number, since it uses less digits than its factorization.

642020620 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1395729 (or 1395727 counting only the distinct ones).

The product of its (nonzero) digits is 1152, while the sum is 22.

The square root of 642020620 is about 25338.1258186157. The cubic root of 642020620 is about 862.6798594312.

Adding to 642020620 its reverse (26020246), we get a palindrome (668040866).

The spelling of 642020620 in words is "six hundred forty-two million, twenty thousand, six hundred twenty".