82378649 has 2 divisors, whose sum is σ = 82378650. Its totient is φ = 82378648.

The previous prime is 82378643. The next prime is 82378657. The reversal of 82378649 is 94687328.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 70023424 + 12355225 = 8368^2 + 3515^2 .

It is a cyclic number.

It is not a de Polignac number, because 82378649 - 2⁸ = 82378393 is a prime.

It is a super-2 number, since 2×82378649² = 13572483622130402, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (82378643) 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 as a sum of consecutive naturals, namely, 41189324 + 41189325.

It is an arithmetic number, because the mean of its divisors is an integer number (41189325).

Almost surely, 2^82378649 is an apocalyptic number.

It is an amenable number.

82378649 is a deficient number, since it is larger than the sum of its proper divisors (1).

82378649 is an equidigital number, since it uses as much as digits as its factorization.

82378649 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 580608, while the sum is 47.

The square root of 82378649 is about 9076.2684512965. The cubic root of 82378649 is about 435.1158347441.

The spelling of 82378649 in words is "eighty-two million, three hundred seventy-eight thousand, six hundred forty-nine".