53217780 has 96 divisors (see below), whose sum is σ = 185794560. Its totient is φ = 11057280.

The previous prime is 53217779. The next prime is 53217781. The reversal of 53217780 is 8771235.

It is an interprime number because it is at equal distance from previous prime (53217779) and next prime (53217781).

It is a Harshad number since it is a multiple of its sum of digits (33).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (53217781) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 1140 + ... + 10379.

It is an arithmetic number, because the mean of its divisors is an integer number (1935360).

Almost surely, 2^53217780 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 53217780, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (92897280).

53217780 is an abundant number, since it is smaller than the sum of its proper divisors (132576780).

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

53217780 is a wasteful number, since it uses less digits than its factorization.

53217780 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11549 (or 11547 counting only the distinct ones).

The product of its (nonzero) digits is 11760, while the sum is 33.

The square root of 53217780 is about 7295.0517475889. The cubic root of 53217780 is about 376.1423653589.

The spelling of 53217780 in words is "fifty-three million, two hundred seventeen thousand, seven hundred eighty".