64761973 has 2 divisors, whose sum is σ = 64761974. Its totient is φ = 64761972.

The previous prime is 64761967. The next prime is 64761989. The reversal of 64761973 is 37916746.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 64673764 + 88209 = 8042^2 + 297^2 .

It is a cyclic number.

It is not a de Polignac number, because 64761973 - 2⁹ = 64761461 is a prime.

It is a super-2 number, since 2×64761973² = 8388226293705458, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (64761923) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 32380986 + 32380987.

It is an arithmetic number, because the mean of its divisors is an integer number (32380987).

Almost surely, 2^64761973 is an apocalyptic number.

It is an amenable number.

64761973 is a deficient number, since it is larger than the sum of its proper divisors (1).

64761973 is an equidigital number, since it uses as much as digits as its factorization.

64761973 is an evil number, because the sum of its binary digits is even.

The product of its digits is 190512, while the sum is 43.

The square root of 64761973 is about 8047.4824013476. The cubic root of 64761973 is about 401.5811851480.

The spelling of 64761973 in words is "sixty-four million, seven hundred sixty-one thousand, nine hundred seventy-three".