64736642 has 16 divisors (see below), whose sum is σ = 101590200. Its totient is φ = 30898560.

The previous prime is 64736627. The next prime is 64736669. The reversal of 64736642 is 24663746.

It can be written as a sum of positive squares in 4 ways, for example, as 57441241 + 7295401 = 7579^2 + 2701^2 .

It is a junction number, because it is equal to n+sod(n) for n = 64736596 and 64736605.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1109 + ... + 11432.

Almost surely, 2^64736642 is an apocalyptic number.

64736642 is a deficient number, since it is larger than the sum of its proper divisors (36853558).

64736642 is a wasteful number, since it uses less digits than its factorization.

64736642 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12661.

The product of its digits is 145152, while the sum is 38.

The square root of 64736642 is about 8045.9084011689. The cubic root of 64736642 is about 401.5288201612.

The spelling of 64736642 in words is "sixty-four million, seven hundred thirty-six thousand, six hundred forty-two".