82733781 has 48 divisors (see below), whose sum is σ = 131232960. Its totient is φ = 46126080.

The previous prime is 82733767. The next prime is 82733789. The reversal of 82733781 is 18733728.

82733781 = T₄₆₅ + T₄₆₆ + ... + T₈₄₁.

It is not a de Polignac number, because 82733781 - 2⁹ = 82733269 is a prime.

It is a super-2 number, since 2×82733781² = 13689757037111922, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (39).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (82733789) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 249786 + ... + 250116.

It is an arithmetic number, because the mean of its divisors is an integer number (2734020).

Almost surely, 2^82733781 is an apocalyptic number.

It is an amenable number.

82733781 is a deficient number, since it is larger than the sum of its proper divisors (48499179).

82733781 is a wasteful number, since it uses less digits than its factorization.

82733781 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 406 (or 393 counting only the distinct ones).

The product of its digits is 56448, while the sum is 39.

The square root of 82733781 is about 9095.8111787789. The cubic root of 82733781 is about 435.7401957078.

The spelling of 82733781 in words is "eighty-two million, seven hundred thirty-three thousand, seven hundred eighty-one".