52780784 has 80 divisors (see below), whose sum is σ = 130348800. Its totient is φ = 20155392.

The previous prime is 52780781. The next prime is 52780787. The reversal of 52780784 is 48708725.

It is an interprime number because it is at equal distance from previous prime (52780781) and next prime (52780787).

It is a super-2 number, since 2×52780784² = 5571622319309312, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (52780781) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 35447 + ... + 36905.

It is an arithmetic number, because the mean of its divisors is an integer number (1629360).

Almost surely, 2^52780784 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 52780784, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (65174400).

52780784 is an abundant number, since it is smaller than the sum of its proper divisors (77568016).

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

52780784 is a wasteful number, since it uses less digits than its factorization.

52780784 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1510 (or 1504 counting only the distinct ones).

The product of its (nonzero) digits is 125440, while the sum is 41.

The square root of 52780784 is about 7265.0384720248. The cubic root of 52780784 is about 375.1099742638.

The spelling of 52780784 in words is "fifty-two million, seven hundred eighty thousand, seven hundred eighty-four".