64997964 has 60 divisors (see below), whose sum is σ = 172035864. Its totient is φ = 21396096.

The previous prime is 64997963. The next prime is 64997969. The reversal of 64997964 is 46979946.

It is a Harshad number since it is a multiple of its sum of digits (54).

It is a self number, because there is not a number n which added to its sum of digits gives 64997964.

It is not an unprimeable number, because it can be changed into a prime (64997963) by changing a digit.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 25684 + ... + 28100.

Almost surely, 2^64997964 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 64997964, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (86017932).

64997964 is an abundant number, since it is smaller than the sum of its proper divisors (107037900).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

64997964 is a wasteful number, since it uses less digits than its factorization.

64997964 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2516 (or 2505 counting only the distinct ones).

The product of its digits is 2939328, while the sum is 54.

The square root of 64997964 is about 8062.1314799500. The cubic root of 64997964 is about 402.0683777650.

The spelling of 64997964 in words is "sixty-four million, nine hundred ninety-seven thousand, nine hundred sixty-four".