64276981 has 16 divisors (see below), whose sum is σ = 71027200. Its totient is φ = 57931200.

The previous prime is 64276967. The next prime is 64276987. The reversal of 64276981 is 18967246.

It is a cyclic number.

It is not a de Polignac number, because 64276981 - 2⁹ = 64276469 is a prime.

It is a super-2 number, since 2×64276981² = 8263060572948722, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (64276987) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 35035 + ... + 36823.

It is an arithmetic number, because the mean of its divisors is an integer number (4439200).

Almost surely, 2^64276981 is an apocalyptic number.

64276981 is a gapful number since it is divisible by the number (61) formed by its first and last digit.

It is an amenable number.

64276981 is a deficient number, since it is larger than the sum of its proper divisors (6750219).

64276981 is a wasteful number, since it uses less digits than its factorization.

64276981 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1900.

The product of its digits is 145152, while the sum is 43.

The square root of 64276981 is about 8017.2926228247. The cubic root of 64276981 is about 400.5762132970.

The spelling of 64276981 in words is "sixty-four million, two hundred seventy-six thousand, nine hundred eighty-one".