61257705 has 32 divisors (see below), whose sum is σ = 102236160. Its totient is φ = 31285440.

The previous prime is 61257701. The next prime is 61257709. The reversal of 61257705 is 50775216.

It is an interprime number because it is at equal distance from previous prime (61257701) and next prime (61257709).

It is not a de Polignac number, because 61257705 - 2² = 61257701 is a prime.

It is not an unprimeable number, because it can be changed into a prime (61257701) 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 31 ways as a sum of consecutive naturals, for example, 47256 + ... + 48534.

It is an arithmetic number, because the mean of its divisors is an integer number (3194880).

Almost surely, 2^61257705 is an apocalyptic number.

It is an amenable number.

61257705 is a deficient number, since it is larger than the sum of its proper divisors (40978455).

61257705 is a wasteful number, since it uses less digits than its factorization.

61257705 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1421.

The product of its (nonzero) digits is 14700, while the sum is 33.

The square root of 61257705 is about 7826.7301601627. The cubic root of 61257705 is about 394.2032864906.

The spelling of 61257705 in words is "sixty-one million, two hundred fifty-seven thousand, seven hundred five".