52861440 has 80 divisors (see below), whose sum is σ = 169015968. Its totient is φ = 14094336.

The previous prime is 52861433. The next prime is 52861447. The reversal of 52861440 is 4416825.

It is an interprime number because it is at equal distance from previous prime (52861433) and next prime (52861447).

It is a tau number, because it is divible by the number of its divisors (80).

It is a Harshad number since it is a multiple of its sum of digits (30).

It is a junction number, because it is equal to n+sod(n) for n = 52861398 and 52861407.

It is not an unprimeable number, because it can be changed into a prime (52861447) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4239 + ... + 11121.

Almost surely, 2^52861440 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 52861440, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (84507984).

52861440 is an abundant number, since it is smaller than the sum of its proper divisors (116154528).

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

52861440 is an equidigital number, since it uses as much as digits as its factorization.

52861440 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6909 (or 6893 counting only the distinct ones).

The product of its (nonzero) digits is 7680, while the sum is 30.

The square root of 52861440 is about 7270.5873215305. The cubic root of 52861440 is about 375.3009495249.

It can be divided in two parts, 52861 and 440, that added together give a triangular number (53301 = T₃₂₆).

The spelling of 52861440 in words is "fifty-two million, eight hundred sixty-one thousand, four hundred forty".