82649391 has 32 divisors (see below), whose sum is σ = 126316800. Its totient is φ = 47604480.

The previous prime is 82649387. The next prime is 82649407. The reversal of 82649391 is 19394628.

It is not a de Polignac number, because 82649391 - 2² = 82649387 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (82644391) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 63475 + ... + 64763.

It is an arithmetic number, because the mean of its divisors is an integer number (3947400).

Almost surely, 2^82649391 is an apocalyptic number.

82649391 is a deficient number, since it is larger than the sum of its proper divisors (43667409).

82649391 is a wasteful number, since it uses less digits than its factorization.

82649391 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1399.

The product of its digits is 93312, while the sum is 42.

The square root of 82649391 is about 9091.1710466804. The cubic root of 82649391 is about 435.5919909297.

The spelling of 82649391 in words is "eighty-two million, six hundred forty-nine thousand, three hundred ninety-one".