30936978 has 90 divisors (see below), whose sum is σ = 76481559. Its totient is φ = 9344808.

The previous prime is 30936973. The next prime is 30936989. The reversal of 30936978 is 87963903.

It is a happy number.

30936978 is nontrivially palindromic in base 5.

It can be written as a sum of positive squares in only one way, i.e., 15468489 + 15468489 = 3933^2 + 3933^2 .

It is an ABA number since it can be written as A⋅B^A, here for A=2, B=3933.

It is not an unprimeable number, because it can be changed into a prime (30936973) by changing a digit.

It is a polite number, since it can be written in 44 ways as a sum of consecutive naturals, for example, 1345075 + ... + 1345097.

Almost surely, 2^30936978 is an apocalyptic number.

30936978 is a gapful number since it is divisible by the number (38) formed by its first and last digit.

It is a practical number, because each smaller number is the sum of distinct divisors of 30936978

30936978 is an abundant number, since it is smaller than the sum of its proper divisors (45544581).

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

30936978 is a wasteful number, since it uses less digits than its factorization.

30936978 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 98 (or 47 counting only the distinct ones).

The product of its (nonzero) digits is 244944, while the sum is 45.

The square root of 30936978 is about 5562.1019408134. The cubic root of 30936978 is about 313.9250433006.

The spelling of 30936978 in words is "thirty million, nine hundred thirty-six thousand, nine hundred seventy-eight".