64731761 has 4 divisors (see below), whose sum is σ = 64791552. Its totient is φ = 64671972.

The previous prime is 64731749. The next prime is 64731769. The reversal of 64731761 is 16713746.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 64731761 - 2¹⁴ = 64715377 is a prime.

It is a super-2 number, since 2×64731761² = 8380401764322242, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (64731769) 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 3 ways as a sum of consecutive naturals, for example, 28241 + ... + 30446.

It is an arithmetic number, because the mean of its divisors is an integer number (16197888).

Almost surely, 2^64731761 is an apocalyptic number.

It is an amenable number.

64731761 is a deficient number, since it is larger than the sum of its proper divisors (59791).

64731761 is a wasteful number, since it uses less digits than its factorization.

64731761 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 59790.

The product of its digits is 21168, while the sum is 35.

The square root of 64731761 is about 8045.6050735790. The cubic root of 64731761 is about 401.5187284452.

The spelling of 64731761 in words is "sixty-four million, seven hundred thirty-one thousand, seven hundred sixty-one".