55162640 has 160 divisors (see below), whose sum is σ = 149990400. Its totient is φ = 18708480.

The previous prime is 55162633. The next prime is 55162649. The reversal of 55162640 is 4626155.

It is a Harshad number since it is a multiple of its sum of digits (29).

It is not an unprimeable number, because it can be changed into a prime (55162649) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 934931 + ... + 934989.

It is an arithmetic number, because the mean of its divisors is an integer number (937440).

Almost surely, 2^55162640 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 55162640, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (74995200).

55162640 is an abundant number, since it is smaller than the sum of its proper divisors (94827760).

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

55162640 is a wasteful number, since it uses less digits than its factorization.

55162640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 145 (or 139 counting only the distinct ones).

The product of its (nonzero) digits is 7200, while the sum is 29.

The square root of 55162640 is about 7427.1555793588. The cubic root of 55162640 is about 380.6697330593.

Adding to 55162640 its reverse (4626155), we get a palindrome (59788795).

The spelling of 55162640 in words is "fifty-five million, one hundred sixty-two thousand, six hundred forty".