870800778 has 24 divisors (see below), whose sum is σ = 1887322788. Its totient is φ = 290176512.

The previous prime is 870800771. The next prime is 870800789. The reversal of 870800778 is 877008078.

870800778 is a nontrivial binomial coefficient, being equal to C(41733, 2).

It can be written as a sum of positive squares in 2 ways, for example, as 868068369 + 2732409 = 29463^2 + 1653^2 .

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (870800771) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 78250 + ... + 88682.

Almost surely, 2^870800778 is an apocalyptic number.

870800778 is the 41732-nd triangular number.

870800778 is an abundant number, since it is smaller than the sum of its proper divisors (1016522010).

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

870800778 is a wasteful number, since it uses less digits than its factorization.

870800778 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15078 (or 15075 counting only the distinct ones).

The product of its (nonzero) digits is 175616, while the sum is 45.

The square root of 870800778 is about 29509.3337437496. Note that the first 3 decimals coincide. The cubic root of 870800778 is about 954.9330757265.

The spelling of 870800778 in words is "eight hundred seventy million, eight hundred thousand, seven hundred seventy-eight".