1878464640 has 512 divisors, whose sum is σ = 7217683200. Its totient is φ = 410517504.

The previous prime is 1878464629. The next prime is 1878464669. The reversal of 1878464640 is 464648781.

It is a Harshad number since it is a multiple of its sum of digits (48).

It is a self number, because there is not a number n which added to its sum of digits gives 1878464640.

It is an unprimeable number.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 8061964 + ... + 8062196.

Almost surely, 2^1878464640 is an apocalyptic number.

1878464640 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1878464640, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (3608841600).

1878464640 is an abundant number, since it is smaller than the sum of its proper divisors (5339218560).

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

1878464640 is a wasteful number, since it uses less digits than its factorization.

1878464640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 304 (or 292 counting only the distinct ones).

The product of its (nonzero) digits is 1032192, while the sum is 48.

The square root of 1878464640 is about 43341.2579420579. The cubic root of 1878464640 is about 1233.8650842327.

The spelling of 1878464640 in words is "one billion, eight hundred seventy-eight million, four hundred sixty-four thousand, six hundred forty".