53407840 has 72 divisors (see below), whose sum is σ = 132109488. Its totient is φ = 20401920.

The previous prime is 53407813. The next prime is 53407847. The reversal of 53407840 is 4870435.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (53407847) 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, 84325 + ... + 84955.

It is an arithmetic number, because the mean of its divisors is an integer number (1834854).

Almost surely, 2^53407840 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 53407840, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (66054744).

53407840 is an abundant number, since it is smaller than the sum of its proper divisors (78701648).

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

53407840 is a wasteful number, since it uses less digits than its factorization.

53407840 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 692 (or 661 counting only the distinct ones).

The product of its (nonzero) digits is 13440, while the sum is 31.

The square root of 53407840 is about 7308.0667758307. The cubic root of 53407840 is about 376.5896136363.

The spelling of 53407840 in words is "fifty-three million, four hundred seven thousand, eight hundred forty".