64997504 has 128 divisors (see below), whose sum is σ = 157308480. Its totient is φ = 26357760.

The previous prime is 64997489. The next prime is 64997507. The reversal of 64997504 is 40579946.

64997504 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a tau number, because it is divible by the number of its divisors (128).

It is a Harshad number since it is a multiple of its sum of digits (44).

It is not an unprimeable number, because it can be changed into a prime (64997507) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 970079 + ... + 970145.

Almost surely, 2^64997504 is an apocalyptic number.

64997504 is a gapful number since it is divisible by the number (64) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 64997504, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (78654240).

64997504 is an abundant number, since it is smaller than the sum of its proper divisors (92310976).

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

64997504 is a wasteful number, since it uses less digits than its factorization.

64997504 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 158 (or 146 counting only the distinct ones).

The product of its (nonzero) digits is 272160, while the sum is 44.

The square root of 64997504 is about 8062.1029514637. The cubic root of 64997504 is about 402.0674292641.

The spelling of 64997504 in words is "sixty-four million, nine hundred ninety-seven thousand, five hundred four".