76826781 has 12 divisors (see below), whose sum is σ = 111376252. Its totient is φ = 51031296.

The previous prime is 76826753. The next prime is 76826801. The reversal of 76826781 is 18762867.

It can be written as a sum of positive squares in 2 ways, for example, as 7371225 + 69455556 = 2715^2 + 8334^2 .

It is not a de Polignac number, because 76826781 - 2¹⁰ = 76825757 is a prime.

It is a super-2 number, since 2×76826781² = 11804708557643922, 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 (76826731) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 12916 + ... + 17901.

Almost surely, 2^76826781 is an apocalyptic number.

It is an amenable number.

76826781 is a deficient number, since it is larger than the sum of its proper divisors (34549471).

76826781 is a wasteful number, since it uses less digits than its factorization.

76826781 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 31100 (or 31097 counting only the distinct ones).

The product of its digits is 225792, while the sum is 45.

The square root of 76826781 is about 8765.0887616726. The cubic root of 76826781 is about 425.1128300199.

The spelling of 76826781 in words is "seventy-six million, eight hundred twenty-six thousand, seven hundred eighty-one".