55409090 has 32 divisors (see below), whose sum is σ = 112320000. Its totient is φ = 19497600.

The previous prime is 55409089. The next prime is 55409113. The reversal of 55409090 is 9090455.

55409090 is a modest number, since divided by 9090 gives 5540 as remainder.

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, 4715 + ... + 11534.

It is an arithmetic number, because the mean of its divisors is an integer number (3510000).

Almost surely, 2^55409090 is an apocalyptic number.

55409090 is an abundant number, since it is smaller than the sum of its proper divisors (56910910).

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

55409090 is a wasteful number, since it uses less digits than its factorization.

55409090 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16298.

The product of its (nonzero) digits is 8100, while the sum is 32.

The square root of 55409090 is about 7443.7282325458. The cubic root of 55409090 is about 381.2357966580.

The spelling of 55409090 in words is "fifty-five million, four hundred nine thousand, ninety".