55491480 has 224 divisors, whose sum is σ = 205396560. Its totient is φ = 13374720.

The previous prime is 55491473. The next prime is 55491497. The reversal of 55491480 is 8419455.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 55 ways as a sum of consecutive naturals, for example, 320674 + ... + 320846.

Almost surely, 2^55491480 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 55491480, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (102698280).

55491480 is an abundant number, since it is smaller than the sum of its proper divisors (149905080).

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

55491480 is a wasteful number, since it uses less digits than its factorization.

55491480 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 213 (or 194 counting only the distinct ones).

The product of its (nonzero) digits is 28800, while the sum is 36.

The square root of 55491480 is about 7449.2603659692. The cubic root of 55491480 is about 381.4246613483.

The spelling of 55491480 in words is "fifty-five million, four hundred ninety-one thousand, four hundred eighty".