642644036 has 6 divisors (see below), whose sum is σ = 1124627070. Its totient is φ = 321322016.

The previous prime is 642644029. The next prime is 642644077. The reversal of 642644036 is 630446246.

It can be written as a sum of positive squares in only one way, i.e., 353440000 + 289204036 = 18800^2 + 17006^2 .

It is a junction number, because it is equal to n+sod(n) for n = 642643987 and 642644005.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 80330501 + ... + 80330508.

It is an arithmetic number, because the mean of its divisors is an integer number (187437845).

Almost surely, 2^642644036 is an apocalyptic number.

It is an amenable number.

642644036 is a deficient number, since it is larger than the sum of its proper divisors (481983034).

642644036 is a wasteful number, since it uses less digits than its factorization.

642644036 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 160661013 (or 160661011 counting only the distinct ones).

The product of its (nonzero) digits is 82944, while the sum is 35.

The square root of 642644036 is about 25350.4247696168. The cubic root of 642644036 is about 862.9589960767.

The spelling of 642644036 in words is "six hundred forty-two million, six hundred forty-four thousand, thirty-six".