64702261 has 4 divisors (see below), whose sum is σ = 69679372. Its totient is φ = 59725152.

The previous prime is 64702259. The next prime is 64702271. The reversal of 64702261 is 16220746.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 2592100 + 62110161 = 1610^2 + 7881^2 .

It is a cyclic number.

It is not a de Polignac number, because 64702261 - 2¹ = 64702259 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (64702271) 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, 2488536 + ... + 2488561.

It is an arithmetic number, because the mean of its divisors is an integer number (17419843).

Almost surely, 2^64702261 is an apocalyptic number.

It is an amenable number.

64702261 is a deficient number, since it is larger than the sum of its proper divisors (4977111).

64702261 is a wasteful number, since it uses less digits than its factorization.

64702261 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4977110.

The product of its (nonzero) digits is 4032, while the sum is 28.

The square root of 64702261 is about 8043.7715656277. The cubic root of 64702261 is about 401.4577248920.

The spelling of 64702261 in words is "sixty-four million, seven hundred two thousand, two hundred sixty-one".