55451520 has 128 divisors (see below), whose sum is σ = 196452000. Its totient is φ = 14782464.

The previous prime is 55451507. The next prime is 55451521. The reversal of 55451520 is 2515455.

It is a tau number, because it is divible by the number of its divisors (128).

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (55451521) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 15676 + ... + 18884.

Almost surely, 2^55451520 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 55451520, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (98226000).

55451520 is an abundant number, since it is smaller than the sum of its proper divisors (141000480).

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

55451520 is a wasteful number, since it uses less digits than its factorization.

55451520 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3237 (or 3219 counting only the distinct ones).

The product of its (nonzero) digits is 5000, while the sum is 27.

The square root of 55451520 is about 7446.5777374577. The cubic root of 55451520 is about 381.3330833889. Note that the first 3 decimals are identical.

Adding to 55451520 its reverse (2515455), we get a palindrome (57966975).

The spelling of 55451520 in words is "fifty-five million, four hundred fifty-one thousand, five hundred twenty".