82946781 has 16 divisors (see below), whose sum is σ = 123361920. Its totient is φ = 55082880.

The previous prime is 82946767. The next prime is 82946833. The reversal of 82946781 is 18764928.

It is not a de Polignac number, because 82946781 - 2¹⁰ = 82945757 is a prime.

It is a super-2 number, since 2×82946781² = 13760336956523922, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (82946741) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1261 + ... + 12941.

It is an arithmetic number, because the mean of its divisors is an integer number (7710120).

Almost surely, 2^82946781 is an apocalyptic number.

It is an amenable number.

82946781 is a deficient number, since it is larger than the sum of its proper divisors (40415139).

82946781 is a wasteful number, since it uses less digits than its factorization.

82946781 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11953 (or 11947 counting only the distinct ones).

The product of its digits is 193536, while the sum is 45.

The square root of 82946781 is about 9107.5123387235. The cubic root of 82946781 is about 436.1138162727.

The spelling of 82946781 in words is "eighty-two million, nine hundred forty-six thousand, seven hundred eighty-one".