64670761 has 2 divisors, whose sum is σ = 64670762. Its totient is φ = 64670760.

The previous prime is 64670741. The next prime is 64670777. The reversal of 64670761 is 16707646.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 64000000 + 670761 = 8000^2 + 819^2 .

It is a cyclic number.

It is not a de Polignac number, because 64670761 - 2⁵ = 64670729 is a prime.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 64670761.

It is not a weakly prime, because it can be changed into another prime (64670701) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 32335380 + 32335381.

It is an arithmetic number, because the mean of its divisors is an integer number (32335381).

Almost surely, 2^64670761 is an apocalyptic number.

It is an amenable number.

64670761 is a deficient number, since it is larger than the sum of its proper divisors (1).

64670761 is an equidigital number, since it uses as much as digits as its factorization.

64670761 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 42336, while the sum is 37.

The square root of 64670761 is about 8041.8132905459. The cubic root of 64670761 is about 401.3925650305.

It can be divided in two parts, 64 and 670761, that multiplied together give a square (42928704 = 6552²).

The spelling of 64670761 in words is "sixty-four million, six hundred seventy thousand, seven hundred sixty-one".