278431972 has 48 divisors (see below), whose sum is σ = 601171200. Its totient is φ = 109878912.

The previous prime is 278431957. The next prime is 278431973. The reversal of 278431972 is 279134872.

It is not an unprimeable number, because it can be changed into a prime (278431973) 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, 217398 + ... + 218674.

It is an arithmetic number, because the mean of its divisors is an integer number (12524400).

Almost surely, 2^278431972 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 278431972, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (300585600).

278431972 is an abundant number, since it is smaller than the sum of its proper divisors (322739228).

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

278431972 is a wasteful number, since it uses less digits than its factorization.

278431972 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1900 (or 1898 counting only the distinct ones).

The product of its digits is 169344, while the sum is 43.

The square root of 278431972 is about 16686.2809517280. The cubic root of 278431972 is about 652.9897553713.

The spelling of 278431972 in words is "two hundred seventy-eight million, four hundred thirty-one thousand, nine hundred seventy-two".