55709940 has 192 divisors, whose sum is σ = 188762112. Its totient is φ = 12096000.

The previous prime is 55709923. The next prime is 55709959. The reversal of 55709940 is 4990755.

It is a Harshad number since it is a multiple of its sum of digits (39).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 368865 + ... + 369015.

It is an arithmetic number, because the mean of its divisors is an integer number (983136).

Almost surely, 2^55709940 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 55709940, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (94381056).

55709940 is an abundant number, since it is smaller than the sum of its proper divisors (133052172).

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

55709940 is a wasteful number, since it uses less digits than its factorization.

55709940 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 230 (or 228 counting only the distinct ones).

The product of its (nonzero) digits is 56700, while the sum is 39.

The square root of 55709940 is about 7463.9091634344. The cubic root of 55709940 is about 381.9245394287.

The spelling of 55709940 in words is "fifty-five million, seven hundred nine thousand, nine hundred forty".