64406641 has 8 divisors (see below), whose sum is σ = 69448680. Its totient is φ = 59377152.

The previous prime is 64406633. The next prime is 64406669. The reversal of 64406641 is 14660446.

It can be written as a sum of positive squares in 4 ways, for example, as 3629025 + 60777616 = 1905^2 + 7796^2 .

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

It is a cyclic number.

It is not a de Polignac number, because 64406641 - 2³ = 64406633 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (64406611) 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, 9411 + ... + 14743.

It is an arithmetic number, because the mean of its divisors is an integer number (8681085).

Almost surely, 2^64406641 is an apocalyptic number.

It is an amenable number.

64406641 is a deficient number, since it is larger than the sum of its proper divisors (5042039).

64406641 is a wasteful number, since it uses less digits than its factorization.

64406641 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6275.

The product of its (nonzero) digits is 13824, while the sum is 31.

The square root of 64406641 is about 8025.3748199072. The cubic root of 64406641 is about 400.8453808195.

The spelling of 64406641 in words is "sixty-four million, four hundred six thousand, six hundred forty-one".