30105978 has 16 divisors (see below), whose sum is σ = 68813760. Its totient is φ = 8601696.

The previous prime is 30105967. The next prime is 30106039. The reversal of 30105978 is 87950103.

It is a super-2 number, since 2×30105978² = 1812739822672968, which contains 22 as substring.

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, 358363 + ... + 358446.

It is an arithmetic number, because the mean of its divisors is an integer number (4300860).

Almost surely, 2^30105978 is an apocalyptic number.

30105978 is an abundant number, since it is smaller than the sum of its proper divisors (38707782).

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

30105978 is a wasteful number, since it uses less digits than its factorization.

30105978 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 716821.

The product of its (nonzero) digits is 7560, while the sum is 33.

The square root of 30105978 is about 5486.8914696757. The cubic root of 30105978 is about 311.0887075799.

The spelling of 30105978 in words is "thirty million, one hundred five thousand, nine hundred seventy-eight".