55415000 has 40 divisors (see below), whose sum is σ = 129849060. Its totient is φ = 22164000.

The previous prime is 55414987. The next prime is 55415047. The reversal of 55415000 is 51455.

It is a tau number, because it is divible by the number of its divisors (40).

It is a hoax number, since the sum of its digits (20) coincides with the sum of the digits of its distinct prime factors.

It is a Harshad number since it is a multiple of its sum of digits (20).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 9 ways as a sum of consecutive naturals, for example, 542 + ... + 10541.

Almost surely, 2^55415000 is an apocalyptic number.

55415000 is a gapful number since it is divisible by the number (50) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 55415000, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (64924530).

55415000 is an abundant number, since it is smaller than the sum of its proper divisors (74434060).

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

55415000 is a wasteful number, since it uses less digits than its factorization.

55415000 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11109 (or 11090 counting only the distinct ones).

The product of its (nonzero) digits is 500, while the sum is 20.

The square root of 55415000 is about 7444.1252004517. The cubic root of 55415000 is about 381.2493505319.

Adding to 55415000 its reverse (51455), we get a palindrome (55466455).

The spelling of 55415000 in words is "fifty-five million, four hundred fifteen thousand".