64406351 has 4 divisors (see below), whose sum is σ = 65070432. Its totient is φ = 63742272.

The previous prime is 64406339. The next prime is 64406359. The reversal of 64406351 is 15360446.

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 64406351 - 2¹⁸ = 64144207 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (64406359) 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, 331895 + ... + 332088.

It is an arithmetic number, because the mean of its divisors is an integer number (16267608).

Almost surely, 2^64406351 is an apocalyptic number.

64406351 is a deficient number, since it is larger than the sum of its proper divisors (664081).

64406351 is an equidigital number, since it uses as much as digits as its factorization.

64406351 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 664080.

The product of its (nonzero) digits is 8640, while the sum is 29.

The square root of 64406351 is about 8025.3567521949. The cubic root of 64406351 is about 400.8447791976.

Adding to 64406351 its reverse (15360446), we get a palindrome (79766797).

The spelling of 64406351 in words is "sixty-four million, four hundred six thousand, three hundred fifty-one".