77825081 has 8 divisors (see below), whose sum is σ = 80189064. Its totient is φ = 75496320.

The previous prime is 77825063. The next prime is 77825131. The reversal of 77825081 is 18052877.

It can be written as a sum of positive squares in 4 ways, for example, as 1175056 + 76650025 = 1084^2 + 8755^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 77825081 - 2¹⁴ = 77808697 is a prime.

It is a super-2 number, since 2×77825081² = 12113486465313122, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (77825281) 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 7 ways as a sum of consecutive naturals, for example, 4286 + ... + 13191.

It is an arithmetic number, because the mean of its divisors is an integer number (10023633).

Almost surely, 2^77825081 is an apocalyptic number.

It is an amenable number.

77825081 is a deficient number, since it is larger than the sum of its proper divisors (2363983).

77825081 is a wasteful number, since it uses less digits than its factorization.

77825081 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17611.

The product of its (nonzero) digits is 31360, while the sum is 38.

The square root of 77825081 is about 8821.8524698614. The cubic root of 77825081 is about 426.9462405834.

The spelling of 77825081 in words is "seventy-seven million, eight hundred twenty-five thousand, eighty-one".