82157743 has 4 divisors (see below), whose sum is σ = 82971288. Its totient is φ = 81344200.

The previous prime is 82157737. The next prime is 82157773. The reversal of 82157743 is 34775128.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-82157743 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 (82157773) 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, 406621 + ... + 406822.

It is an arithmetic number, because the mean of its divisors is an integer number (20742822).

Almost surely, 2^82157743 is an apocalyptic number.

82157743 is a deficient number, since it is larger than the sum of its proper divisors (813545).

82157743 is a wasteful number, since it uses less digits than its factorization.

82157743 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 813544.

The product of its digits is 47040, while the sum is 37.

The square root of 82157743 is about 9064.0908534723. The cubic root of 82157743 is about 434.7265520600.

It can be divided in two parts, 821 and 57743, that added together give a square (58564 = 242²).

The spelling of 82157743 in words is "eighty-two million, one hundred fifty-seven thousand, seven hundred forty-three".