82787990 has 8 divisors (see below), whose sum is σ = 149018400. Its totient is φ = 33115192.

The previous prime is 82787963. The next prime is 82788023. The reversal of 82787990 is 9978728.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4139390 + ... + 4139409.

It is an arithmetic number, because the mean of its divisors is an integer number (18627300).

Almost surely, 2^82787990 is an apocalyptic number.

82787990 is a deficient number, since it is larger than the sum of its proper divisors (66230410).

82787990 is a wasteful number, since it uses less digits than its factorization.

82787990 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8278806.

The product of its (nonzero) digits is 508032, while the sum is 50.

The square root of 82787990 is about 9098.7905789726. The cubic root of 82787990 is about 435.8353437954.

The spelling of 82787990 in words is "eighty-two million, seven hundred eighty-seven thousand, nine hundred ninety".