1878444645 has 64 divisors (see below), whose sum is σ = 3823718400. Its totient is φ = 780628800.

The previous prime is 1878444641. The next prime is 1878444647. The reversal of 1878444645 is 5464448781.

It is not a de Polignac number, because 1878444645 - 2² = 1878444641 is a prime.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1878444641) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 40000 + ... + 73190.

It is an arithmetic number, because the mean of its divisors is an integer number (59745600).

Almost surely, 2^1878444645 is an apocalyptic number.

1878444645 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

1878444645 is an abundant number, since it is smaller than the sum of its proper divisors (1945273755).

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

1878444645 is a wasteful number, since it uses less digits than its factorization.

1878444645 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 33231 (or 33217 counting only the distinct ones).

The product of its digits is 3440640, while the sum is 51.

The square root of 1878444645 is about 43341.0272720894. The cubic root of 1878444645 is about 1233.8607063276.

The spelling of 1878444645 in words is "one billion, eight hundred seventy-eight million, four hundred forty-four thousand, six hundred forty-five".