64053981 has 6 divisors (see below), whose sum is σ = 92522430. Its totient is φ = 42702648.

The previous prime is 64053973. The next prime is 64053991. The reversal of 64053981 is 18935046.

64053981 is a `hidden beast` number, since 6 + 40 + 539 + 81 = 666.

It can be written as a sum of positive squares in only one way, i.e., 63920025 + 133956 = 7995^2 + 366^2 .

It is not a de Polignac number, because 64053981 - 2³ = 64053973 is a prime.

It is a super-2 number, since 2×64053981² = 8205824963896722, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (64053901) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 3558546 + ... + 3558563.

It is an arithmetic number, because the mean of its divisors is an integer number (15420405).

Almost surely, 2^64053981 is an apocalyptic number.

It is an amenable number.

64053981 is a deficient number, since it is larger than the sum of its proper divisors (28468449).

64053981 is a wasteful number, since it uses less digits than its factorization.

64053981 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7117115 (or 7117112 counting only the distinct ones).

The product of its (nonzero) digits is 25920, while the sum is 36.

The square root of 64053981 is about 8003.3731013867. The cubic root of 64053981 is about 400.1124288131.

The spelling of 64053981 in words is "sixty-four million, fifty-three thousand, nine hundred eighty-one".