278971240 has 32 divisors (see below), whose sum is σ = 631550880. Its totient is φ = 110901312.

The previous prime is 278971223. The next prime is 278971249. The reversal of 278971240 is 42179872.

It is a Harshad number since it is a multiple of its sum of digits (40).

It is a junction number, because it is equal to n+sod(n) for n = 278971193 and 278971202.

It is not an unprimeable number, because it can be changed into a prime (278971249) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 14874 + ... + 27913.

It is an arithmetic number, because the mean of its divisors is an integer number (19735965).

Almost surely, 2^278971240 is an apocalyptic number.

278971240 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

278971240 is an abundant number, since it is smaller than the sum of its proper divisors (352579640).

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

278971240 is a wasteful number, since it uses less digits than its factorization.

278971240 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 42961 (or 42957 counting only the distinct ones).

The product of its (nonzero) digits is 56448, while the sum is 40.

The square root of 278971240 is about 16702.4321582217. The cubic root of 278971240 is about 653.4110544310.

The spelling of 278971240 in words is "two hundred seventy-eight million, nine hundred seventy-one thousand, two hundred forty".