55480278 has 64 divisors (see below), whose sum is σ = 134184960. Its totient is φ = 14949792.

The previous prime is 55480267. The next prime is 55480289. The reversal of 55480278 is 87208455.

It is an interprime number because it is at equal distance from previous prime (55480267) and next prime (55480289).

It is a super-2 number, since 2×55480278² = 6156122493914568, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 75951 + ... + 76677.

It is an arithmetic number, because the mean of its divisors is an integer number (2096640).

Almost surely, 2^55480278 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 55480278, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (67092480).

55480278 is an abundant number, since it is smaller than the sum of its proper divisors (78704682).

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

55480278 is a wasteful number, since it uses less digits than its factorization.

55480278 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 841.

The product of its (nonzero) digits is 89600, while the sum is 39.

The square root of 55480278 is about 7448.5084412921. The cubic root of 55480278 is about 381.3989937046.

The spelling of 55480278 in words is "fifty-five million, four hundred eighty thousand, two hundred seventy-eight".