30732240 has 160 divisors (see below), whose sum is σ = 118849536. Its totient is φ = 6382080.

The previous prime is 30732211. The next prime is 30732263. The reversal of 30732240 is 4223703.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (21).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 17649 + ... + 19311.

Almost surely, 2^30732240 is an apocalyptic number.

30732240 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 30732240, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (59424768).

30732240 is an abundant number, since it is smaller than the sum of its proper divisors (88117296).

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

30732240 is a wasteful number, since it uses less digits than its factorization.

30732240 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1697 (or 1691 counting only the distinct ones).

The product of its (nonzero) digits is 1008, while the sum is 21.

The square root of 30732240 is about 5543.6666566452. Note that the first 4 decimals coincide. The cubic root of 30732240 is about 313.2310012390.

Adding to 30732240 its reverse (4223703), we get a palindrome (34955943).

The spelling of 30732240 in words is "thirty million, seven hundred thirty-two thousand, two hundred forty".