55195840 has 112 divisors (see below), whose sum is σ = 154131264. Its totient is φ = 18432000.

The previous prime is 55195831. The next prime is 55195871. The reversal of 55195840 is 4859155.

It is a tau number, because it is divible by the number of its divisors (112).

It is a self number, because there is not a number n which added to its sum of digits gives 55195840.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 91540 + ... + 92140.

It is an arithmetic number, because the mean of its divisors is an integer number (1376172).

Almost surely, 2^55195840 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 55195840, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (77065632).

55195840 is an abundant number, since it is smaller than the sum of its proper divisors (98935424).

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

55195840 is a wasteful number, since it uses less digits than its factorization.

55195840 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 666 (or 656 counting only the distinct ones).

The product of its (nonzero) digits is 36000, while the sum is 37.

The square root of 55195840 is about 7429.3902845388. The cubic root of 55195840 is about 380.7460872761.

The spelling of 55195840 in words is "fifty-five million, one hundred ninety-five thousand, eight hundred forty".