30661905 has 8 divisors (see below), whose sum is σ = 49059072. Its totient is φ = 16353008.

The previous prime is 30661889. The next prime is 30661913. The reversal of 30661905 is 50916603.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 30661905 - 2⁴ = 30661889 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1022049 + ... + 1022078.

It is an arithmetic number, because the mean of its divisors is an integer number (6132384).

Almost surely, 2^30661905 is an apocalyptic number.

It is an amenable number.

30661905 is a deficient number, since it is larger than the sum of its proper divisors (18397167).

30661905 is a wasteful number, since it uses less digits than its factorization.

30661905 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2044135.

The product of its (nonzero) digits is 4860, while the sum is 30.

The square root of 30661905 is about 5537.3192972773. The cubic root of 30661905 is about 312.9918611595.

The spelling of 30661905 in words is "thirty million, six hundred sixty-one thousand, nine hundred five".