54991590 has 64 divisors (see below), whose sum is σ = 135717120. Its totient is φ = 14256000.

The previous prime is 54991589. The next prime is 54991603. The reversal of 54991590 is 9519945.

It is a happy number.

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, 218965 + ... + 219215.

It is an arithmetic number, because the mean of its divisors is an integer number (2120580).

Almost surely, 2^54991590 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 54991590, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (67858560).

54991590 is an abundant number, since it is smaller than the sum of its proper divisors (80725530).

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

54991590 is a wasteful number, since it uses less digits than its factorization.

54991590 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 437.

The product of its (nonzero) digits is 72900, while the sum is 42.

The square root of 54991590 is about 7415.6314633347. The cubic root of 54991590 is about 380.2758615546.

The spelling of 54991590 in words is "fifty-four million, nine hundred ninety-one thousand, five hundred ninety".