82906781 has 4 divisors (see below), whose sum is σ = 82979232. Its totient is φ = 82834332.

The previous prime is 82906763. The next prime is 82906801. The reversal of 82906781 is 18760928.

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 82906781 - 2¹⁸ = 82644637 is a prime.

It is a super-2 number, since 2×82906781² = 13747068671563922, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (82906711) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 34481 + ... + 36806.

It is an arithmetic number, because the mean of its divisors is an integer number (20744808).

Almost surely, 2^82906781 is an apocalyptic number.

It is an amenable number.

82906781 is a deficient number, since it is larger than the sum of its proper divisors (72451).

82906781 is a wasteful number, since it uses less digits than its factorization.

82906781 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 72450.

The product of its (nonzero) digits is 48384, while the sum is 41.

The square root of 82906781 is about 9105.3160845739. The cubic root of 82906781 is about 436.0437016067.

The spelling of 82906781 in words is "eighty-two million, nine hundred six thousand, seven hundred eighty-one".