4644878440 has 16 divisors (see below), whose sum is σ = 10450976580. Its totient is φ = 1857951360.

The previous prime is 4644878437. The next prime is 4644878443. The reversal of 4644878440 is 448784464.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (4644878437) and next prime (4644878443).

It can be written as a sum of positive squares in 2 ways, for example, as 3971268324 + 673610116 = 63018^2 + 25954^2 .

It is not an unprimeable number, because it can be changed into a prime (4644878443) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 58060941 + ... + 58061020.

Almost surely, 2^4644878440 is an apocalyptic number.

4644878440 is a gapful number since it is divisible by the number (40) formed by its first and last digit.

It is an amenable number.

4644878440 is an abundant number, since it is smaller than the sum of its proper divisors (5806098140).

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

4644878440 is a wasteful number, since it uses less digits than its factorization.

4644878440 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 116121972 (or 116121968 counting only the distinct ones).

The product of its (nonzero) digits is 2752512, while the sum is 49.

The square root of 4644878440 is about 68153.3450389634. The cubic root of 4644878440 is about 1668.4945185528.

The spelling of 4644878440 in words is "four billion, six hundred forty-four million, eight hundred seventy-eight thousand, four hundred forty".