278428927632 has 80 divisors (see below), whose sum is σ = 729987956352. Its totient is φ = 91429381120.

The previous prime is 278428927631. The next prime is 278428927687. The reversal of 278428927632 is 236729824872.

It is not an unprimeable number, because it can be changed into a prime (278428927631) 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, 4320028 + ... + 4384004.

Almost surely, 2^278428927632 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 278428927632, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (364993978176).

278428927632 is an abundant number, since it is smaller than the sum of its proper divisors (451559028720).

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

278428927632 is a wasteful number, since it uses less digits than its factorization.

278428927632 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 65336 (or 65330 counting only the distinct ones).

The product of its digits is 32514048, while the sum is 60.

The spelling of 278428927632 in words is "two hundred seventy-eight billion, four hundred twenty-eight million, nine hundred twenty-seven thousand, six hundred thirty-two".