278858365632 has 840 divisors, whose sum is σ = 1064416768800. Its totient is φ = 70618521600.

The previous prime is 278858365631. The next prime is 278858365633. The reversal of 278858365632 is 236563858872.

It is an interprime number because it is at equal distance from previous prime (278858365631) and next prime (278858365633).

It is a Harshad number since it is a multiple of its sum of digits (63).

It is a self number, because there is not a number n which added to its sum of digits gives 278858365632.

It is not an unprimeable number, because it can be changed into a prime (278858365631) by changing a digit.

It is a polite number, since it can be written in 119 ways as a sum of consecutive naturals, for example, 180023994 + ... + 180025542.

It is an arithmetic number, because the mean of its divisors is an integer number (1267162820).

Almost surely, 2^278858365632 is an apocalyptic number.

278858365632 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 278858365632, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (532208384400).

278858365632 is an abundant number, since it is smaller than the sum of its proper divisors (785558403168).

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

278858365632 is a wasteful number, since it uses less digits than its factorization.

278858365632 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1643 (or 1613 counting only the distinct ones).

The product of its digits is 116121600, while the sum is 63.

The spelling of 278858365632 in words is "two hundred seventy-eight billion, eight hundred fifty-eight million, three hundred sixty-five thousand, six hundred thirty-two".