64398506 has 4 divisors (see below), whose sum is σ = 96597762. Its totient is φ = 32199252.

The previous prime is 64398487. The next prime is 64398511. The reversal of 64398506 is 60589346.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 55368481 + 9030025 = 7441^2 + 3005^2 .

It is a Curzon number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 16099625 + ... + 16099628.

Almost surely, 2^64398506 is an apocalyptic number.

64398506 is a deficient number, since it is larger than the sum of its proper divisors (32199256).

64398506 is a wasteful number, since it uses less digits than its factorization.

64398506 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 32199255.

The product of its (nonzero) digits is 155520, while the sum is 41.

The square root of 64398506 is about 8024.8679739918. The cubic root of 64398506 is about 400.8285036030.

The spelling of 64398506 in words is "sixty-four million, three hundred ninety-eight thousand, five hundred six".