642694627248 has 80 divisors (see below), whose sum is σ = 1667986992000. Its totient is φ = 213241262080.

The previous prime is 642694627207. The next prime is 642694627277. The reversal of 642694627248 is 842726496246.

It is a happy number.

It is a junction number, because it is equal to n+sod(n) for n = 642694627191 and 642694627200.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 8994703 + ... + 9065873.

It is an arithmetic number, because the mean of its divisors is an integer number (20849837400).

Almost surely, 2^642694627248 is an apocalyptic number.

It is an amenable number.

642694627248 is an abundant number, since it is smaller than the sum of its proper divisors (1025292364752).

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

642694627248 is a wasteful number, since it uses less digits than its factorization.

642694627248 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 72050 (or 72044 counting only the distinct ones).

The product of its digits is 55738368, while the sum is 60.

The spelling of 642694627248 in words is "six hundred forty-two billion, six hundred ninety-four million, six hundred twenty-seven thousand, two hundred forty-eight".