77998801 has 8 divisors (see below), whose sum is σ = 78705000. Its totient is φ = 77296128.

The previous prime is 77998751. The next prime is 77998813. The reversal of 77998801 is 10889977.

It can be written as a sum of positive squares in 4 ways, for example, as 11560000 + 66438801 = 3400^2 + 8151^2 .

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 77998801 - 2⁷ = 77998673 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (77998831) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 61825 + ... + 63073.

It is an arithmetic number, because the mean of its divisors is an integer number (9838125).

Almost surely, 2^77998801 is an apocalyptic number.

It is an amenable number.

77998801 is a deficient number, since it is larger than the sum of its proper divisors (706199).

77998801 is a wasteful number, since it uses less digits than its factorization.

77998801 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1763.

The product of its (nonzero) digits is 254016, while the sum is 49.

The square root of 77998801 is about 8831.6929860588. The cubic root of 77998801 is about 427.2636788775.

The spelling of 77998801 in words is "seventy-seven million, nine hundred ninety-eight thousand, eight hundred one".