64406623 has 8 divisors (see below), whose sum is σ = 66967040. Its totient is φ = 61876440.

The previous prime is 64406611. The next prime is 64406627. The reversal of 64406623 is 32660446.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-64406623 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (31).

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (64406627) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3165 + ... + 11782.

It is an arithmetic number, because the mean of its divisors is an integer number (8370880).

Almost surely, 2^64406623 is an apocalyptic number.

64406623 is a deficient number, since it is larger than the sum of its proper divisors (2560417).

64406623 is a wasteful number, since it uses less digits than its factorization.

64406623 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15117.

The product of its (nonzero) digits is 20736, while the sum is 31.

The square root of 64406623 is about 8025.3736984641. The cubic root of 64406623 is about 400.8453434775.

The spelling of 64406623 in words is "sixty-four million, four hundred six thousand, six hundred twenty-three".