55063440 has 120 divisors (see below), whose sum is σ = 190963968. Its totient is φ = 14204160.

The previous prime is 55063433. The next prime is 55063447. The reversal of 55063440 is 4436055.

It is an interprime number because it is at equal distance from previous prime (55063433) and next prime (55063447).

It is a tau number, because it is divible by the number of its divisors (120).

It is not an unprimeable number, because it can be changed into a prime (55063447) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 21087 + ... + 23553.

Almost surely, 2^55063440 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 55063440, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (95481984).

55063440 is an abundant number, since it is smaller than the sum of its proper divisors (135900528).

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

55063440 is a wasteful number, since it uses less digits than its factorization.

55063440 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2517 (or 2508 counting only the distinct ones).

The product of its (nonzero) digits is 7200, while the sum is 27.

The square root of 55063440 is about 7420.4743783669. The cubic root of 55063440 is about 380.4414076537.

Adding to 55063440 its reverse (4436055), we get a palindrome (59499495).

The spelling of 55063440 in words is "fifty-five million, sixty-three thousand, four hundred forty".