53781156 has 144 divisors (see below), whose sum is σ = 165355008. Its totient is φ = 14515200.

The previous prime is 53781139. The next prime is 53781179. The reversal of 53781156 is 65118735.

53781156 is a `hidden beast` number, since 537 + 8 + 115 + 6 = 666.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a self number, because there is not a number n which added to its sum of digits gives 53781156.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 159420 + ... + 159756.

Almost surely, 2^53781156 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 53781156, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (82677504).

53781156 is an abundant number, since it is smaller than the sum of its proper divisors (111573852).

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

53781156 is a wasteful number, since it uses less digits than its factorization.

53781156 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 402 (or 397 counting only the distinct ones).

The product of its digits is 25200, while the sum is 36.

The square root of 53781156 is about 7333.5636630495. The cubic root of 53781156 is about 377.4650196378.

The spelling of 53781156 in words is "fifty-three million, seven hundred eighty-one thousand, one hundred fifty-six".