64689849 has 27 divisors (see below), whose sum is σ = 108981093. Its totient is φ = 36869112.

The previous prime is 64689827. The next prime is 64689883. The reversal of 64689849 is 94898646.

The square root of 64689849 is 8043.

It is a perfect power (a square), and thus also a powerful number.

It is not a de Polignac number, because 64689849 - 2⁵ = 64689817 is a prime.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 64689795 and 64689804.

It is not an unprimeable number, because it can be changed into a prime (64689649) by changing a digit.

It is a polite number, since it can be written in 26 ways as a sum of consecutive naturals, for example, 168712 + ... + 169094.

Almost surely, 2^64689849 is an apocalyptic number.

64689849 is the 8043-rd square number.

64689849 is the 4022-nd centered octagonal number.

It is an amenable number.

64689849 is a deficient number, since it is larger than the sum of its proper divisors (44291244).

64689849 is an equidigital number, since it uses as much as digits as its factorization.

64689849 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 786 (or 393 counting only the distinct ones).

The product of its digits is 2985984, while the sum is 54.

The cubic root of 64689849 is about 401.4320523634.

Multiplying 64689849 by its product of digits (2985984), we get a square (193162854076416 = 13898304²).

The spelling of 64689849 in words is "sixty-four million, six hundred eighty-nine thousand, eight hundred forty-nine".