77751081 has 24 divisors (see below), whose sum is σ = 119251080. Its totient is φ = 48646656.

The previous prime is 77751077. The next prime is 77751101. The reversal of 77751081 is 18015777.

It can be written as a sum of positive squares in 4 ways, for example, as 3515625 + 74235456 = 1875^2 + 8616^2 .

It is not a de Polignac number, because 77751081 - 2² = 77751077 is a prime.

It is a super-2 number, since 2×77751081² = 12090461193337122, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (77751041) 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 23 ways as a sum of consecutive naturals, for example, 93375 + ... + 94203.

It is an arithmetic number, because the mean of its divisors is an integer number (4968795).

Almost surely, 2^77751081 is an apocalyptic number.

It is an amenable number.

77751081 is a deficient number, since it is larger than the sum of its proper divisors (41499999).

77751081 is a wasteful number, since it uses less digits than its factorization.

77751081 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1465 (or 1462 counting only the distinct ones).

The product of its (nonzero) digits is 13720, while the sum is 36.

The square root of 77751081 is about 8817.6573419475. The cubic root of 77751081 is about 426.8108770201.

The spelling of 77751081 in words is "seventy-seven million, seven hundred fifty-one thousand, eighty-one".