64072681 has 2 divisors, whose sum is σ = 64072682. Its totient is φ = 64072680.

The previous prime is 64072667. The next prime is 64072699. The reversal of 64072681 is 18627046.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 57229225 + 6843456 = 7565^2 + 2616^2 .

It is a cyclic number.

It is not a de Polignac number, because 64072681 - 2⁵ = 64072649 is a prime.

It is a super-2 number, since 2×64072681² = 8210616901055522, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (64072621) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 32036340 + 32036341.

It is an arithmetic number, because the mean of its divisors is an integer number (32036341).

Almost surely, 2^64072681 is an apocalyptic number.

It is an amenable number.

64072681 is a deficient number, since it is larger than the sum of its proper divisors (1).

64072681 is an equidigital number, since it uses as much as digits as its factorization.

64072681 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 16128, while the sum is 34.

The square root of 64072681 is about 8004.5412735522. The cubic root of 64072681 is about 400.1513614670.

The spelling of 64072681 in words is "sixty-four million, seventy-two thousand, six hundred eighty-one".