64398837 has 4 divisors (see below), whose sum is σ = 85865120. Its totient is φ = 42932556.

The previous prime is 64398797. The next prime is 64398853. The reversal of 64398837 is 73889346.

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.

It is a de Polignac number, because none of the positive numbers 2^k-64398837 is a prime.

It is a Duffinian number.

It is a zygodrome in base 4.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (64398877) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 10733137 + ... + 10733142.

It is an arithmetic number, because the mean of its divisors is an integer number (21466280).

Almost surely, 2^64398837 is an apocalyptic number.

It is an amenable number.

64398837 is a deficient number, since it is larger than the sum of its proper divisors (21466283).

64398837 is a wasteful number, since it uses less digits than its factorization.

64398837 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21466282.

The product of its digits is 870912, while the sum is 48.

The square root of 64398837 is about 8024.8885973576. Note that the first 3 decimals coincide. The cubic root of 64398837 is about 400.8291903374.

The spelling of 64398837 in words is "sixty-four million, three hundred ninety-eight thousand, eight hundred thirty-seven".