278640342 has 24 divisors (see below), whose sum is σ = 604051344. Its totient is φ = 92829264.

The previous prime is 278640317. The next prime is 278640367. The reversal of 278640342 is 243046872.

278640342 is a `hidden beast` number, since 2 + 7 + 8 + 640 + 3 + 4 + 2 = 666.

It is an interprime number because it is at equal distance from previous prime (278640317) and next prime (278640367).

It is a junction number, because it is equal to n+sod(n) for n = 278640297 and 278640306.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 45028 + ... + 50840.

It is an arithmetic number, because the mean of its divisors is an integer number (25168806).

Almost surely, 2^278640342 is an apocalyptic number.

278640342 is an abundant number, since it is smaller than the sum of its proper divisors (325411002).

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

278640342 is a wasteful number, since it uses less digits than its factorization.

278640342 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8484 (or 8481 counting only the distinct ones).

The product of its (nonzero) digits is 64512, while the sum is 36.

The square root of 278640342 is about 16692.5235360026. The cubic root of 278640342 is about 653.1526072959.

The spelling of 278640342 in words is "two hundred seventy-eight million, six hundred forty thousand, three hundred forty-two".