3978251280 has 80 divisors (see below), whose sum is σ = 13702872960. Its totient is φ = 1060866432.

The previous prime is 3978251273. The next prime is 3978251287. The reversal of 3978251280 is 821528793.

It is a happy number.

3978251280 is a `hidden beast` number, since 397 + 8 + 251 + 2 + 8 + 0 = 666.

It is an interprime number because it is at equal distance from previous prime (3978251273) and next prime (3978251287).

It is a tau number, because it is divible by the number of its divisors (80).

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

It is not an unprimeable number, because it can be changed into a prime (3978251287) 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, 918732 + ... + 923051.

It is an arithmetic number, because the mean of its divisors is an integer number (171285912).

Almost surely, 2^3978251280 is an apocalyptic number.

3978251280 is a gapful number since it is divisible by the number (30) formed by its first and last digit.

It is an amenable number.

3978251280 is an abundant number, since it is smaller than the sum of its proper divisors (9724621680).

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

3978251280 is a wasteful number, since it uses less digits than its factorization.

3978251280 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1841805 (or 1841793 counting only the distinct ones).

The product of its (nonzero) digits is 241920, while the sum is 45.

The square root of 3978251280 is about 63073.3801218866. The cubic root of 3978251280 is about 1584.5188268298.

The spelling of 3978251280 in words is "three billion, nine hundred seventy-eight million, two hundred fifty-one thousand, two hundred eighty".