64140761 has 4 divisors (see below), whose sum is σ = 65044224. Its totient is φ = 63237300.

The previous prime is 64140743. The next prime is 64140763. The reversal of 64140761 is 16704146.

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 64140761 - 2⁶ = 64140697 is a prime.

It is a super-2 number, since 2×64140761² = 8228074443318242, which contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (64140763) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 451625 + ... + 451766.

It is an arithmetic number, because the mean of its divisors is an integer number (16261056).

Almost surely, 2^64140761 is an apocalyptic number.

It is an amenable number.

64140761 is a deficient number, since it is larger than the sum of its proper divisors (903463).

64140761 is an equidigital number, since it uses as much as digits as its factorization.

64140761 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 903462.

The product of its (nonzero) digits is 4032, while the sum is 29.

The square root of 64140761 is about 8008.7927304932. The cubic root of 64140761 is about 400.2930373537.

The spelling of 64140761 in words is "sixty-four million, one hundred forty thousand, seven hundred sixty-one".