191687448 has 48 divisors (see below), whose sum is σ = 496365480. Its totient is φ = 61686016.

The previous prime is 191687413. The next prime is 191687449. The reversal of 191687448 is 844786191.

It is a junction number, because it is equal to n+sod(n) for n = 191687397 and 191687406.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (191687449) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 15436 + ... + 24932.

Almost surely, 2^191687448 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 191687448, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (248182740).

191687448 is an abundant number, since it is smaller than the sum of its proper divisors (304678032).

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

191687448 is a wasteful number, since it uses less digits than its factorization.

191687448 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9564 (or 9531 counting only the distinct ones).

The product of its digits is 387072, while the sum is 48.

The square root of 191687448 is about 13845.1236180830. The cubic root of 191687448 is about 576.5866178365.

The spelling of 191687448 in words is "one hundred ninety-one million, six hundred eighty-seven thousand, four hundred forty-eight".