61709257 has 8 divisors (see below), whose sum is σ = 63761984. Its totient is φ = 59684688.

The previous prime is 61709243. The next prime is 61709267. The reversal of 61709257 is 75290716.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 61709257 - 2¹¹ = 61707209 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (61709267) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2538 + ... + 11395.

It is an arithmetic number, because the mean of its divisors is an integer number (7970248).

Almost surely, 2^61709257 is an apocalyptic number.

It is an amenable number.

61709257 is a deficient number, since it is larger than the sum of its proper divisors (2052727).

61709257 is a wasteful number, since it uses less digits than its factorization.

61709257 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14079.

The product of its (nonzero) digits is 26460, while the sum is 37.

The square root of 61709257 is about 7855.5239799774. The cubic root of 61709257 is about 395.1695197177.

The spelling of 61709257 in words is "sixty-one million, seven hundred nine thousand, two hundred fifty-seven".