30778236 has 18 divisors (see below), whose sum is σ = 77800632. Its totient is φ = 10259400.

The previous prime is 30778217. The next prime is 30778243. The reversal of 30778236 is 63287703.

It is a tau number, because it is divible by the number of its divisors (18).

It is a super-2 number, since 2×30778236² = 1894599622543392, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (36), and also a Moran number because the ratio is a prime number: 854951 = 30778236 / (3 + 0 + 7 + 7 + 8 + 2 + 3 + 6).

It is a self number, because there is not a number n which added to its sum of digits gives 30778236.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 427440 + ... + 427511.

Almost surely, 2^30778236 is an apocalyptic number.

30778236 is a gapful number since it is divisible by the number (36) formed by its first and last digit.

It is an amenable number.

30778236 is an abundant number, since it is smaller than the sum of its proper divisors (47022396).

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

30778236 is a wasteful number, since it uses less digits than its factorization.

30778236 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 854961 (or 854956 counting only the distinct ones).

The product of its (nonzero) digits is 42336, while the sum is 36.

The square root of 30778236 is about 5547.8136234016. The cubic root of 30778236 is about 313.3871910841.

The spelling of 30778236 in words is "thirty million, seven hundred seventy-eight thousand, two hundred thirty-six".