55457440 has 48 divisors (see below), whose sum is σ = 131604480. Its totient is φ = 22083840.

The previous prime is 55457431. The next prime is 55457449. The reversal of 55457440 is 4475455.

It is an interprime number because it is at equal distance from previous prime (55457431) and next prime (55457449).

It is a junction number, because it is equal to n+sod(n) for n = 55457396 and 55457405.

It is not an unprimeable number, because it can be changed into a prime (55457449) 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, 42721 + ... + 43999.

It is an arithmetic number, because the mean of its divisors is an integer number (2741760).

Almost surely, 2^55457440 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 55457440, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (65802240).

55457440 is an abundant number, since it is smaller than the sum of its proper divisors (76147040).

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

55457440 is a wasteful number, since it uses less digits than its factorization.

55457440 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1565 (or 1557 counting only the distinct ones).

The product of its (nonzero) digits is 56000, while the sum is 34.

The square root of 55457440 is about 7446.9752248816. The cubic root of 55457440 is about 381.3466532695.

The spelling of 55457440 in words is "fifty-five million, four hundred fifty-seven thousand, four hundred forty".