77800038 has 16 divisors (see below), whose sum is σ = 155691840. Its totient is φ = 25918056.

The previous prime is 77800013. The next prime is 77800039. The reversal of 77800038 is 83000877.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 77799981 and 77800008.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (77800039) 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, 12681 + ... + 17787.

It is an arithmetic number, because the mean of its divisors is an integer number (9730740).

Almost surely, 2^77800038 is an apocalyptic number.

77800038 is an abundant number, since it is smaller than the sum of its proper divisors (77891802).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

77800038 is a wasteful number, since it uses less digits than its factorization.

77800038 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7651.

The product of its (nonzero) digits is 9408, while the sum is 33.

The square root of 77800038 is about 8820.4329825695. The cubic root of 77800038 is about 426.9004406021.

The spelling of 77800038 in words is "seventy-seven million, eight hundred thousand, thirty-eight".