82457861 has 4 divisors (see below), whose sum is σ = 85117824. Its totient is φ = 79797900.

The previous prime is 82457849. The next prime is 82457887. The reversal of 82457861 is 16875428.

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.

It is a cyclic number.

It is not a de Polignac number, because 82457861 - 2¹⁰ = 82456837 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 (82457831) 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, 1329935 + ... + 1329996.

It is an arithmetic number, because the mean of its divisors is an integer number (21279456).

Almost surely, 2^82457861 is an apocalyptic number.

It is an amenable number.

82457861 is a deficient number, since it is larger than the sum of its proper divisors (2659963).

82457861 is a wasteful number, since it uses less digits than its factorization.

82457861 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2659962.

The product of its digits is 107520, while the sum is 41.

The square root of 82457861 is about 9080.6310904034. The cubic root of 82457861 is about 435.2552533704.

It can be divided in two parts, 824 and 57861, that added together give a palindrome (58685).

The spelling of 82457861 in words is "eighty-two million, four hundred fifty-seven thousand, eight hundred sixty-one".