813878550 has 48 divisors (see below), whose sum is σ = 2242691280. Its totient is φ = 217033920.

The previous prime is 813878543. The next prime is 813878551. The reversal of 813878550 is 55878318.

It is a happy number.

813878550 is a `hidden beast` number, since 8 + 13 + 87 + 8 + 550 = 666.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a junction number, because it is equal to n+sod(n) for n = 813878496 and 813878505.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (813878551) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 300087 + ... + 302786.

It is an arithmetic number, because the mean of its divisors is an integer number (46722735).

Almost surely, 2^813878550 is an apocalyptic number.

813878550 is an abundant number, since it is smaller than the sum of its proper divisors (1428812730).

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

813878550 is a wasteful number, since it uses less digits than its factorization.

813878550 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 602894 (or 602883 counting only the distinct ones).

The product of its (nonzero) digits is 268800, while the sum is 45.

The square root of 813878550 is about 28528.5567458293. The cubic root of 813878550 is about 933.6552298133.

The spelling of 813878550 in words is "eight hundred thirteen million, eight hundred seventy-eight thousand, five hundred fifty".