64724761 has 4 divisors (see below), whose sum is σ = 66230032. Its totient is φ = 63219492.

The previous prime is 64724753. The next prime is 64724801. The reversal of 64724761 is 16742746.

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, and also an emirpimes, since its reverse is a distinct semiprime: 16742746 = 2 ⋅8371373.

It is a cyclic number.

It is not a de Polignac number, because 64724761 - 2³ = 64724753 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 64724761.

It is not an unprimeable number, because it can be changed into a prime (64724701) 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, 752571 + ... + 752656.

It is an arithmetic number, because the mean of its divisors is an integer number (16557508).

Almost surely, 2^64724761 is an apocalyptic number.

It is an amenable number.

64724761 is a deficient number, since it is larger than the sum of its proper divisors (1505271).

64724761 is a wasteful number, since it uses less digits than its factorization.

64724761 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1505270.

The product of its digits is 56448, while the sum is 37.

The square root of 64724761 is about 8045.1700417083. The cubic root of 64724761 is about 401.5042547032.

The spelling of 64724761 in words is "sixty-four million, seven hundred twenty-four thousand, seven hundred sixty-one".