82758991 has 12 divisors (see below), whose sum is σ = 100457712. Its totient is φ = 67851168.

The previous prime is 82758989. The next prime is 82759049. The reversal of 82758991 is 19985728.

It is not a de Polignac number, because 82758991 - 2¹ = 82758989 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (49).

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (82758971) by changing a digit.

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 11 ways as a sum of consecutive naturals, for example, 35590 + ... + 37843.

It is an arithmetic number, because the mean of its divisors is an integer number (8371476).

Almost surely, 2^82758991 is an apocalyptic number.

82758991 is a deficient number, since it is larger than the sum of its proper divisors (17698721).

82758991 is a wasteful number, since it uses less digits than its factorization.

82758991 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 73470 (or 73463 counting only the distinct ones).

The product of its digits is 362880, while the sum is 49.

The square root of 82758991 is about 9097.1968759613. The cubic root of 82758991 is about 435.7844496777.

The spelling of 82758991 in words is "eighty-two million, seven hundred fifty-eight thousand, nine hundred ninety-one".