77803081 has 6 divisors (see below), whose sum is σ = 82113882. Its totient is φ = 73707840.

The previous prime is 77803073. The next prime is 77803093. The reversal of 77803081 is 18030877.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 77721856 + 81225 = 8816^2 + 285^2 .

It is not a de Polignac number, because 77803081 - 2³ = 77803073 is a prime.

It is a super-2 number, since 2×77803081² = 12106638826185122, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (77803051) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 107400 + ... + 108121.

It is an arithmetic number, because the mean of its divisors is an integer number (13685647).

Almost surely, 2^77803081 is an apocalyptic number.

It is an amenable number.

77803081 is a deficient number, since it is larger than the sum of its proper divisors (4310801).

77803081 is a wasteful number, since it uses less digits than its factorization.

77803081 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 215559 (or 215540 counting only the distinct ones).

The product of its (nonzero) digits is 9408, while the sum is 34.

The square root of 77803081 is about 8820.6054780837. The cubic root of 77803081 is about 426.9060063282.

The spelling of 77803081 in words is "seventy-seven million, eight hundred three thousand, eighty-one".