64837661 has 8 divisors (see below), whose sum is σ = 74161920. Its totient is φ = 55528848.

The previous prime is 64837631. The next prime is 64837681. The reversal of 64837661 is 16673846.

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 64837661 - 2¹⁸ = 64575517 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (64837601) 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, 7295 + ... + 13523.

It is an arithmetic number, because the mean of its divisors is an integer number (9270240).

Almost surely, 2^64837661 is an apocalyptic number.

It is an amenable number.

64837661 is a deficient number, since it is larger than the sum of its proper divisors (9324259).

64837661 is a wasteful number, since it uses less digits than its factorization.

64837661 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7723.

The product of its digits is 145152, while the sum is 41.

The square root of 64837661 is about 8052.1836168831. The cubic root of 64837661 is about 401.7375682953.

The spelling of 64837661 in words is "sixty-four million, eight hundred thirty-seven thousand, six hundred sixty-one".