47278440 has 96 divisors (see below), whose sum is σ = 167637600. Its totient is φ = 11460480.

The previous prime is 47278433. The next prime is 47278459. The reversal of 47278440 is 4487274.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a junction number, because it is equal to n+sod(n) for n = 47278395 and 47278404.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 2010 + ... + 9929.

It is an arithmetic number, because the mean of its divisors is an integer number (1746225).

Almost surely, 2^47278440 is an apocalyptic number.

47278440 is a gapful number since it is divisible by the number (40) 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 47278440, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (83818800).

47278440 is an abundant number, since it is smaller than the sum of its proper divisors (120359160).

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

47278440 is a wasteful number, since it uses less digits than its factorization.

47278440 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11967 (or 11960 counting only the distinct ones).

The product of its (nonzero) digits is 50176, while the sum is 36.

The square root of 47278440 is about 6875.9319368359. The cubic root of 47278440 is about 361.5938588836.

The spelling of 47278440 in words is "forty-seven million, two hundred seventy-eight thousand, four hundred forty".