82087858 has 4 divisors (see below), whose sum is σ = 123131790. Its totient is φ = 41043928.

The previous prime is 82087813. The next prime is 82087871. The reversal of 82087858 is 85878028.

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

It can be written as a sum of positive squares in only one way, i.e., 76265289 + 5822569 = 8733^2 + 2413^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 20521963 + ... + 20521966.

Almost surely, 2^82087858 is an apocalyptic number.

82087858 is a deficient number, since it is larger than the sum of its proper divisors (41043932).

82087858 is a wasteful number, since it uses less digits than its factorization.

82087858 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 41043931.

The product of its (nonzero) digits is 286720, while the sum is 46.

The square root of 82087858 is about 9060.2349859151. The cubic root of 82087858 is about 434.6032547613.

It can be divided in two parts, 82087 and 858, that multiplied together give a triangular number (70430646 = T₁₁₈₆₈).

The spelling of 82087858 in words is "eighty-two million, eighty-seven thousand, eight hundred fifty-eight".