306022640 has 240 divisors, whose sum is σ = 928226304. Its totient is φ = 92736000.

The previous prime is 306022621. The next prime is 306022649. The reversal of 306022640 is 46220603.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (306022649) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 2026565 + ... + 2026715.

Almost surely, 2^306022640 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 306022640, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (464113152).

306022640 is an abundant number, since it is smaller than the sum of its proper divisors (622203664).

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

306022640 is a wasteful number, since it uses less digits than its factorization.

306022640 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 236 (or 223 counting only the distinct ones).

The product of its (nonzero) digits is 1728, while the sum is 23.

The square root of 306022640 is about 17493.5027938947. The cubic root of 306022640 is about 673.8830287726.

The spelling of 306022640 in words is "three hundred six million, twenty-two thousand, six hundred forty".