64757661 has 8 divisors (see below), whose sum is σ = 87759264. Its totient is φ = 42463920.

The previous prime is 64757647. The next prime is 64757677. The reversal of 64757661 is 16675746.

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

It is not a de Polignac number, because 64757661 - 2⁶ = 64757597 is a prime.

It is a Smith number, since the sum of its digits (42) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (64757611) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 176751 + ... + 177116.

It is an arithmetic number, because the mean of its divisors is an integer number (10969908).

Almost surely, 2^64757661 is an apocalyptic number.

64757661 is a gapful number since it is divisible by the number (61) formed by its first and last digit.

It is an amenable number.

64757661 is a deficient number, since it is larger than the sum of its proper divisors (23001603).

64757661 is a wasteful number, since it uses less digits than its factorization.

64757661 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 353931.

The product of its digits is 211680, while the sum is 42.

The square root of 64757661 is about 8047.2144870135. The cubic root of 64757661 is about 401.5722722195.

The spelling of 64757661 in words is "sixty-four million, seven hundred fifty-seven thousand, six hundred sixty-one".