55456380 has 192 divisors, whose sum is σ = 209018880. Its totient is φ = 11916288.

The previous prime is 55456343. The next prime is 55456393. The reversal of 55456380 is 8365455.

It is a super-3 number, since 3×55456380³ (a number of 24 digits) contains 333 as substring.

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 63 ways as a sum of consecutive naturals, for example, 63829 + ... + 64691.

It is an arithmetic number, because the mean of its divisors is an integer number (1088640).

Almost surely, 2^55456380 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 55456380, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (104509440).

55456380 is an abundant number, since it is smaller than the sum of its proper divisors (153562500).

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

55456380 is a wasteful number, since it uses less digits than its factorization.

55456380 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 905 (or 897 counting only the distinct ones).

The product of its (nonzero) digits is 72000, while the sum is 36.

The square root of 55456380 is about 7446.9040547062. The cubic root of 55456380 is about 381.3442235983.

The spelling of 55456380 in words is "fifty-five million, four hundred fifty-six thousand, three hundred eighty".