64981533 has 8 divisors (see below), whose sum is σ = 86790528. Its totient is φ = 43246784.

The previous prime is 64981451. The next prime is 64981541. The reversal of 64981533 is 33518946.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 64981533 - 2¹⁴ = 64965149 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 64981491 and 64981500.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (64981573) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 16485 + ... + 20042.

It is an arithmetic number, because the mean of its divisors is an integer number (10848816).

Almost surely, 2^64981533 is an apocalyptic number.

It is an amenable number.

64981533 is a deficient number, since it is larger than the sum of its proper divisors (21808995).

64981533 is a wasteful number, since it uses less digits than its factorization.

64981533 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 37123.

The product of its digits is 77760, while the sum is 39.

The square root of 64981533 is about 8061.1123922198. The cubic root of 64981533 is about 402.0344949484.

The spelling of 64981533 in words is "sixty-four million, nine hundred eighty-one thousand, five hundred thirty-three".