30621900 has 72 divisors (see below), whose sum is σ = 89549824. Its totient is φ = 8078400.

The previous prime is 30621869. The next prime is 30621911. The reversal of 30621900 is 912603.

30621900 = T₄₃₉ + T₄₄₀ + ... + T₆₄₄.

It is a super-2 number, since 2×30621900² = 1875401519220000, which contains 22 as substring.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 30405 + ... + 31395.

Almost surely, 2^30621900 is an apocalyptic number.

30621900 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 30621900, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (44774912).

30621900 is an abundant number, since it is smaller than the sum of its proper divisors (58927924).

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

30621900 is a wasteful number, since it uses less digits than its factorization.

30621900 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1111 (or 1104 counting only the distinct ones).

The product of its (nonzero) digits is 324, while the sum is 21.

The square root of 30621900 is about 5533.7058107565. The cubic root of 30621900 is about 312.8556803525.

The spelling of 30621900 in words is "thirty million, six hundred twenty-one thousand, nine hundred".