76725781 has 16 divisors (see below), whose sum is σ = 89187840. Its totient is φ = 65268720.

The previous prime is 76725731. The next prime is 76725797. The reversal of 76725781 is 18752767.

76725781 = T₁₃₁₈ + T₁₃₁₉ + ... + T₁₄₀₀.

It is not a de Polignac number, because 76725781 - 2¹⁵ = 76693013 is a prime.

It is a super-2 number, since 2×76725781² = 11773690940119922, 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 (76725721) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 15136 + ... + 19558.

It is an arithmetic number, because the mean of its divisors is an integer number (5574240).

Almost surely, 2^76725781 is an apocalyptic number.

It is an amenable number.

76725781 is a deficient number, since it is larger than the sum of its proper divisors (12462059).

76725781 is a wasteful number, since it uses less digits than its factorization.

76725781 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4536.

The product of its digits is 164640, while the sum is 43.

The square root of 76725781 is about 8759.3253735662. The cubic root of 76725781 is about 424.9264574017.

The spelling of 76725781 in words is "seventy-six million, seven hundred twenty-five thousand, seven hundred eighty-one".