278990055666432 has 648 divisors, whose sum is σ = 887324040675072. Its totient is φ = 84241667051520.

The previous prime is 278990055666373. The next prime is 278990055666481. The reversal of 278990055666432 is 234666550099872.

It is a super-2 number, since 2×278990055666432² (a number of 30 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (72).

It is an unprimeable number.

It is a polite number, since it can be written in 71 ways as a sum of consecutive naturals, for example, 124382547103 + ... + 124382549345.

It is an arithmetic number, because the mean of its divisors is an integer number (1369327223264).

Almost surely, 2^{278990055666432} is an apocalyptic number.

278990055666432 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 278990055666432, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (443662020337536).

278990055666432 is an abundant number, since it is smaller than the sum of its proper divisors (608333985008640).

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

278990055666432 is a wasteful number, since it uses less digits than its factorization.

278990055666432 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3677 (or 3649 counting only the distinct ones).

The product of its (nonzero) digits is 1175731200, while the sum is 72.

The spelling of 278990055666432 in words is "two hundred seventy-eight trillion, nine hundred ninety billion, fifty-five million, six hundred sixty-six thousand, four hundred thirty-two".