61857967 has 4 divisors (see below), whose sum is σ = 62495776. Its totient is φ = 61220160.

The previous prime is 61857949. The next prime is 61857973. The reversal of 61857967 is 76975816.

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

It is a cyclic number.

It is not a de Polignac number, because 61857967 - 2⁷ = 61857839 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 61857967.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (61857997) 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, 318759 + ... + 318952.

It is an arithmetic number, because the mean of its divisors is an integer number (15623944).

Almost surely, 2^61857967 is an apocalyptic number.

61857967 is a deficient number, since it is larger than the sum of its proper divisors (637809).

61857967 is an equidigital number, since it uses as much as digits as its factorization.

61857967 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 637808.

The product of its digits is 635040, while the sum is 49.

The square root of 61857967 is about 7864.9835982029. The cubic root of 61857967 is about 395.4866980459.

It can be divided in two parts, 618 and 57967, that added together give a palindrome (58585).

The spelling of 61857967 in words is "sixty-one million, eight hundred fifty-seven thousand, nine hundred sixty-seven".