30661560 has 96 divisors (see below), whose sum is σ = 101593440. Its totient is φ = 8017152.

The previous prime is 30661541. The next prime is 30661577. The reversal of 30661560 is 6516603.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 18277 + ... + 19883.

It is an arithmetic number, because the mean of its divisors is an integer number (1058265).

Almost surely, 2^30661560 is an apocalyptic number.

30661560 is a gapful number since it is divisible by the number (30) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 30661560, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (50796720).

30661560 is an abundant number, since it is smaller than the sum of its proper divisors (70931880).

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

30661560 is a wasteful number, since it uses less digits than its factorization.

30661560 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1677 (or 1670 counting only the distinct ones).

The product of its (nonzero) digits is 3240, while the sum is 27.

The square root of 30661560 is about 5537.2881449316. The cubic root of 30661560 is about 312.9906872533.

The spelling of 30661560 in words is "thirty million, six hundred sixty-one thousand, five hundred sixty".