55150040 has 128 divisors (see below), whose sum is σ = 146733120. Its totient is φ = 18432000.

The previous prime is 55150033. The next prime is 55150061. The reversal of 55150040 is 4005155.

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

It is a junction number, because it is equal to n+sod(n) for n = 55149994 and 55150021.

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, 545990 + ... + 546090.

Almost surely, 2^55150040 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 55150040, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (73366560).

55150040 is an abundant number, since it is smaller than the sum of its proper divisors (91583080).

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

55150040 is a wasteful number, since it uses less digits than its factorization.

55150040 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 213 (or 209 counting only the distinct ones).

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

The square root of 55150040 is about 7426.3072923223. The cubic root of 55150040 is about 380.6407472344.

Adding to 55150040 its reverse (4005155), we get a palindrome (59155195).

The spelling of 55150040 in words is "fifty-five million, one hundred fifty thousand, forty".