64452391 has 4 divisors (see below), whose sum is σ = 64553272. Its totient is φ = 64351512.

The previous prime is 64452383. The next prime is 64452403. The reversal of 64452391 is 19325446.

It is a happy number.

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

It is a cyclic number.

It is not a de Polignac number, because 64452391 - 2³ = 64452383 is a prime.

It is a super-2 number, since 2×64452391² = 8308221411233762, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (64452301) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 49476 + ... + 50761.

It is an arithmetic number, because the mean of its divisors is an integer number (16138318).

Almost surely, 2^64452391 is an apocalyptic number.

64452391 is a deficient number, since it is larger than the sum of its proper divisors (100881).

64452391 is a wasteful number, since it uses less digits than its factorization.

64452391 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 100880.

The product of its digits is 25920, while the sum is 34.

The square root of 64452391 is about 8028.2246480776. The cubic root of 64452391 is about 400.9402692525.

It can be divided in two parts, 6445 and 2391, that added together give a square (8836 = 94²).

The spelling of 64452391 in words is "sixty-four million, four hundred fifty-two thousand, three hundred ninety-one".