65700640 has 24 divisors (see below), whose sum is σ = 155218140. Its totient is φ = 26280192.

The previous prime is 65700629. The next prime is 65700643. The reversal of 65700640 is 4600756.

It can be written as a sum of positive squares in 2 ways, for example, as 65221776 + 478864 = 8076^2 + 692^2 .

It is a junction number, because it is equal to n+sod(n) for n = 65700599 and 65700608.

It is not an unprimeable number, because it can be changed into a prime (65700643) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 205155 + ... + 205474.

Almost surely, 2^65700640 is an apocalyptic number.

It is an amenable number.

65700640 is an abundant number, since it is smaller than the sum of its proper divisors (89517500).

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

65700640 is a wasteful number, since it uses less digits than its factorization.

65700640 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 410644 (or 410636 counting only the distinct ones).

The product of its (nonzero) digits is 5040, while the sum is 28.

The square root of 65700640 is about 8105.5931306722. The cubic root of 65700640 is about 403.5120731058.

The spelling of 65700640 in words is "sixty-five million, seven hundred thousand, six hundred forty".