30207978 has 20 divisors (see below), whose sum is σ = 67688610. Its totient is φ = 10069272.

The previous prime is 30207977. The next prime is 30207979. The reversal of 30207978 is 87970203.

It is an interprime number because it is at equal distance from previous prime (30207977) and next prime (30207979).

It can be written as a sum of positive squares in only one way, i.e., 29844369 + 363609 = 5463^2 + 603^2 .

It is not an unprimeable number, because it can be changed into a prime (30207977) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 9 ways as a sum of consecutive naturals, for example, 93073 + ... + 93396.

Almost surely, 2^30207978 is an apocalyptic number.

30207978 is an abundant number, since it is smaller than the sum of its proper divisors (37480632).

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

30207978 is a wasteful number, since it uses less digits than its factorization.

30207978 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 186483 (or 186474 counting only the distinct ones).

The product of its (nonzero) digits is 21168, while the sum is 36.

The square root of 30207978 is about 5496.1784905514. The cubic root of 30207978 is about 311.4396376643.

The spelling of 30207978 in words is "thirty million, two hundred seven thousand, nine hundred seventy-eight".