30655590 has 128 divisors (see below), whose sum is σ = 92233728. Its totient is φ = 6359040.

The previous prime is 30655561. The next prime is 30655601. The reversal of 30655590 is 9555603.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 110532 + ... + 110808.

It is an arithmetic number, because the mean of its divisors is an integer number (720576).

Almost surely, 2^30655590 is an apocalyptic number.

30655590 is a gapful number since it is divisible by the number (30) formed by its first and last digit.

It is a practical number, because each smaller number is the sum of distinct divisors of 30655590, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (46116864).

30655590 is an abundant number, since it is smaller than the sum of its proper divisors (61578138).

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

30655590 is a wasteful number, since it uses less digits than its factorization.

30655590 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 342.

The product of its (nonzero) digits is 20250, while the sum is 33.

The square root of 30655590 is about 5536.7490461461. The cubic root of 30655590 is about 312.9703721782.

The spelling of 30655590 in words is "thirty million, six hundred fifty-five thousand, five hundred ninety".