64607261 has 4 divisors (see below), whose sum is σ = 64659132. Its totient is φ = 64555392.

The previous prime is 64607251. The next prime is 64607287. The reversal of 64607261 is 16270646.

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 36844900 + 27762361 = 6070^2 + 5269^2 .

It is a cyclic number.

It is not a de Polignac number, because 64607261 - 2¹⁸ = 64345117 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 (64607251) 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, 24020 + ... + 26573.

It is an arithmetic number, because the mean of its divisors is an integer number (16164783).

Almost surely, 2^64607261 is an apocalyptic number.

It is an amenable number.

64607261 is a deficient number, since it is larger than the sum of its proper divisors (51871).

64607261 is a wasteful number, since it uses less digits than its factorization.

64607261 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 51870.

The product of its (nonzero) digits is 12096, while the sum is 32.

The square root of 64607261 is about 8037.8642063673. The cubic root of 64607261 is about 401.2611466771.

The spelling of 64607261 in words is "sixty-four million, six hundred seven thousand, two hundred sixty-one".