278135131000 has 64 divisors (see below), whose sum is σ = 671830997760. Its totient is φ = 107665200000.

The previous prime is 278135130997. The next prime is 278135131049. The reversal of 278135131000 is 131531872.

It is a super-2 number, since 2×278135131000² (a number of 24 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (31).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 4455051 + ... + 4517050.

It is an arithmetic number, because the mean of its divisors is an integer number (10497359340).

Almost surely, 2^278135131000 is an apocalyptic number.

278135131000 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

278135131000 is an abundant number, since it is smaller than the sum of its proper divisors (393695866760).

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

278135131000 is a wasteful number, since it uses less digits than its factorization.

278135131000 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8972153 (or 8972139 counting only the distinct ones).

The product of its (nonzero) digits is 5040, while the sum is 31.

Adding to 278135131000 its reverse (131531872), we get a palindrome (278266662872).

The spelling of 278135131000 in words is "two hundred seventy-eight billion, one hundred thirty-five million, one hundred thirty-one thousand".