30778020 has 144 divisors (see below), whose sum is σ = 114965760. Its totient is φ = 6490368.

The previous prime is 30777941. The next prime is 30778021. The reversal of 30778020 is 2087703.

It is not an unprimeable number, because it can be changed into a prime (30778021) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 15441 + ... + 17319.

Almost surely, 2^30778020 is an apocalyptic number.

30778020 is a gapful number since it is divisible by the number (30) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 30778020, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (57482880).

30778020 is an abundant number, since it is smaller than the sum of its proper divisors (84187740).

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

30778020 is a wasteful number, since it uses less digits than its factorization.

30778020 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1914 (or 1909 counting only the distinct ones).

The product of its (nonzero) digits is 2352, while the sum is 27.

The square root of 30778020 is about 5547.7941562390. The cubic root of 30778020 is about 313.3864579709.

The spelling of 30778020 in words is "thirty million, seven hundred seventy-eight thousand, twenty".