231748781400 has 192 divisors, whose sum is σ = 801132727200. Its totient is φ = 61576174080.

The previous prime is 231748781399. The next prime is 231748781417. The reversal of 231748781400 is 4187847132.

231748781400 is a `hidden beast` number, since 2 + 3 + 174 + 8 + 78 + 1 + 400 = 666.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 1418334 + ... + 1573266.

Almost surely, 2^231748781400 is an apocalyptic number.

231748781400 is a gapful number since it is divisible by the number (20) 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 231748781400, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (400566363600).

231748781400 is an abundant number, since it is smaller than the sum of its proper divisors (569383945800).

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

231748781400 is a wasteful number, since it uses less digits than its factorization.

231748781400 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 155235 (or 155220 counting only the distinct ones).

The product of its (nonzero) digits is 301056, while the sum is 45.

The spelling of 231748781400 in words is "two hundred thirty-one billion, seven hundred forty-eight million, seven hundred eighty-one thousand, four hundred".