278928881906 has 8 divisors (see below), whose sum is σ = 419193311664. Its totient is φ = 139197778020.

The previous prime is 278928881857. The next prime is 278928881941. The reversal of 278928881906 is 609188829872.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a super-2 number, since 2×278928881906² (a number of 24 digits) contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 133330160 + ... + 133332251.

It is an arithmetic number, because the mean of its divisors is an integer number (52399163958).

Almost surely, 2^278928881906 is an apocalyptic number.

278928881906 is a deficient number, since it is larger than the sum of its proper divisors (140264429758).

278928881906 is a wasteful number, since it uses less digits than its factorization.

278928881906 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 266662936.

The product of its (nonzero) digits is 55738368, while the sum is 68.

The spelling of 278928881906 in words is "two hundred seventy-eight billion, nine hundred twenty-eight million, eight hundred eighty-one thousand, nine hundred six".