30555040 has 108 divisors (see below), whose sum is σ = 79641954. Its totient is φ = 11075328.

The previous prime is 30555037. The next prime is 30555043. The reversal of 30555040 is 4055503.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (30555037) and next prime (30555043).

It can be written as a sum of positive squares in only one way, i.e., 27499536 + 3055504 = 5244^2 + 1748^2 .

It is a super-2 number, since 2×30555040² = 1867220938803200, which contains 22 as substring.

It is a hoax number, since the sum of its digits (22) coincides with the sum of the digits of its distinct prime factors.

It is not an unprimeable number, because it can be changed into a prime (30555043) by changing a digit.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 1328469 + ... + 1328491.

Almost surely, 2^30555040 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 30555040, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (39820977).

30555040 is an abundant number, since it is smaller than the sum of its proper divisors (49086914).

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

30555040 is a wasteful number, since it uses less digits than its factorization.

30555040 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 99 (or 49 counting only the distinct ones).

The product of its (nonzero) digits is 1500, while the sum is 22.

The square root of 30555040 is about 5527.6613499743. The cubic root of 30555040 is about 312.6278175801.

The spelling of 30555040 in words is "thirty million, five hundred fifty-five thousand, forty".