61857793 has 4 divisors (see below), whose sum is σ = 61873920. Its totient is φ = 61841668.

The previous prime is 61857767. The next prime is 61857799. The reversal of 61857793 is 39775816.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 61857793 - 2²⁵ = 28303361 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (61857799) 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, 1368 + ... + 11206.

It is an arithmetic number, because the mean of its divisors is an integer number (15468480).

It is a Proth number, since it is equal to 7551 ⋅ 2¹³ + 1 and 7551 < 2¹³.

Almost surely, 2^61857793 is an apocalyptic number.

It is an amenable number.

61857793 is a deficient number, since it is larger than the sum of its proper divisors (16127).

61857793 is an equidigital number, since it uses as much as digits as its factorization.

61857793 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16126.

The product of its digits is 317520, while the sum is 46.

The square root of 61857793 is about 7864.9725365064. The cubic root of 61857793 is about 395.4863272247.

The spelling of 61857793 in words is "sixty-one million, eight hundred fifty-seven thousand, seven hundred ninety-three".