82215550 has 12 divisors (see below), whose sum is σ = 152921016. Its totient is φ = 32886200.

The previous prime is 82215487. The next prime is 82215563. The reversal of 82215550 is 5551228.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 822106 + ... + 822205.

It is an arithmetic number, because the mean of its divisors is an integer number (12743418).

Almost surely, 2^82215550 is an apocalyptic number.

82215550 is a deficient number, since it is larger than the sum of its proper divisors (70705466).

82215550 is a wasteful number, since it uses less digits than its factorization.

82215550 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1644323 (or 1644318 counting only the distinct ones).

The product of its (nonzero) digits is 4000, while the sum is 28.

The square root of 82215550 is about 9067.2790847089. The cubic root of 82215550 is about 434.8284874558.

Adding to 82215550 its reverse (5551228), we get a palindrome (87766778).

The spelling of 82215550 in words is "eighty-two million, two hundred fifteen thousand, five hundred fifty".