1864228878 has 32 divisors (see below), whose sum is σ = 4145702400. Its totient is φ = 620963928.

The previous prime is 1864228859. The next prime is 1864228879. The reversal of 1864228878 is 8788224681.

It is a Harshad number since it is a multiple of its sum of digits (54).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1864228879) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 68443 + ... + 91721.

It is an arithmetic number, because the mean of its divisors is an integer number (129553200).

Almost surely, 2^1864228878 is an apocalyptic number.

1864228878 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

1864228878 is an abundant number, since it is smaller than the sum of its proper divisors (2281473522).

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

1864228878 is a wasteful number, since it uses less digits than its factorization.

1864228878 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 24773 (or 24767 counting only the distinct ones).

The product of its digits is 2752512, while the sum is 54.

The square root of 1864228878 is about 43176.7168506361. The cubic root of 1864228878 is about 1230.7402682453.

The spelling of 1864228878 in words is "one billion, eight hundred sixty-four million, two hundred twenty-eight thousand, eight hundred seventy-eight".