64750981 has 4 divisors (see below), whose sum is σ = 64785312. Its totient is φ = 64716652.

The previous prime is 64750979. The next prime is 64751009. The reversal of 64750981 is 18905746.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 18905746 = 2 ⋅9452873.

It is a cyclic number.

It is not a de Polignac number, because 64750981 - 2¹ = 64750979 is a prime.

It is a super-2 number, since 2×64750981² = 8385379080924722, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (64750181) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 14161 + ... + 18166.

It is an arithmetic number, because the mean of its divisors is an integer number (16196328).

Almost surely, 2^64750981 is an apocalyptic number.

It is an amenable number.

64750981 is a deficient number, since it is larger than the sum of its proper divisors (34331).

64750981 is a wasteful number, since it uses less digits than its factorization.

64750981 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 34330.

The product of its (nonzero) digits is 60480, while the sum is 40.

The square root of 64750981 is about 8046.7994258587. The cubic root of 64750981 is about 401.5584638403.

The spelling of 64750981 in words is "sixty-four million, seven hundred fifty thousand, nine hundred eighty-one".