53621784 has 64 divisors (see below), whose sum is σ = 149961600. Its totient is φ = 17752608.

The previous prime is 53621779. The next prime is 53621797. The reversal of 53621784 is 48712635.

It is a Smith number, since the sum of its digits (36) coincides with the sum of the digits of its prime factors.

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

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, 34447 + ... + 35969.

It is an arithmetic number, because the mean of its divisors is an integer number (2343150).

Almost surely, 2^53621784 is an apocalyptic number.

53621784 is a gapful number since it is divisible by the number (54) 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 53621784, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (74980800).

53621784 is an abundant number, since it is smaller than the sum of its proper divisors (96339816).

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

53621784 is a wasteful number, since it uses less digits than its factorization.

53621784 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1701 (or 1691 counting only the distinct ones).

The product of its digits is 40320, while the sum is 36.

The square root of 53621784 is about 7322.6896697866. The cubic root of 53621784 is about 377.0917979874.

The spelling of 53621784 in words is "fifty-three million, six hundred twenty-one thousand, seven hundred eighty-four".