82378581 has 4 divisors (see below), whose sum is σ = 109838112. Its totient is φ = 54919052.

The previous prime is 82378537. The next prime is 82378591. The reversal of 82378581 is 18587328.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 82378581 - 2⁷ = 82378453 is a prime.

It is a super-2 number, since 2×82378581² = 13572461215147122, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (82378591) 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 3 ways as a sum of consecutive naturals, for example, 13729761 + ... + 13729766.

It is an arithmetic number, because the mean of its divisors is an integer number (27459528).

Almost surely, 2^82378581 is an apocalyptic number.

It is an amenable number.

82378581 is a deficient number, since it is larger than the sum of its proper divisors (27459531).

82378581 is a wasteful number, since it uses less digits than its factorization.

82378581 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 27459530.

The product of its digits is 107520, while the sum is 42.

The square root of 82378581 is about 9076.2647052628. The cubic root of 82378581 is about 435.1157150210.

The spelling of 82378581 in words is "eighty-two million, three hundred seventy-eight thousand, five hundred eighty-one".