64802981 has 2 divisors, whose sum is σ = 64802982. Its totient is φ = 64802980.

The previous prime is 64802921. The next prime is 64802987. The reversal of 64802981 is 18920846.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 54626881 + 10176100 = 7391^2 + 3190^2 .

It is a cyclic number.

It is not a de Polignac number, because 64802981 - 2⁶ = 64802917 is a prime.

It is a super-4 number, since 4×64802981⁴ (a number of 32 digits) contains 4444 as substring. Note that it is a super-d number also for d = 2.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (64802987) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 32401490 + 32401491.

It is an arithmetic number, because the mean of its divisors is an integer number (32401491).

Almost surely, 2^64802981 is an apocalyptic number.

It is an amenable number.

64802981 is a deficient number, since it is larger than the sum of its proper divisors (1).

64802981 is an equidigital number, since it uses as much as digits as its factorization.

64802981 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 27648, while the sum is 38.

The square root of 64802981 is about 8050.0298757210. The cubic root of 64802981 is about 401.6659291512.

The spelling of 64802981 in words is "sixty-four million, eight hundred two thousand, nine hundred eighty-one".