30742992 has 90 divisors (see below), whose sum is σ = 100107618. Its totient is φ = 8781696.

The previous prime is 30742981. The next prime is 30742993. The reversal of 30742992 is 29924703.

It can be written as a sum of positive squares in only one way, i.e., 30735936 + 7056 = 5544^2 + 84^2 .

It is a super-2 number, since 2×30742992² = 1890263114224128, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (30742993) 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, 4878 + ... + 9234.

Almost surely, 2^30742992 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 30742992, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (50053809).

30742992 is an abundant number, since it is smaller than the sum of its proper divisors (69364626).

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

30742992 is a wasteful number, since it uses less digits than its factorization.

30742992 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4385 (or 4369 counting only the distinct ones).

The product of its (nonzero) digits is 27216, while the sum is 36.

The square root of 30742992 is about 5544.6363271183. The cubic root of 30742992 is about 313.2675260421.

The spelling of 30742992 in words is "thirty million, seven hundred forty-two thousand, nine hundred ninety-two".