947128428 has 72 divisors (see below), whose sum is σ = 2425703280. Its totient is φ = 311575680.

The previous prime is 947128423. The next prime is 947128433. The reversal of 947128428 is 824821749.

It is an interprime number because it is at equal distance from previous prime (947128423) and next prime (947128433).

It is a hoax number, since the sum of its digits (45) 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 (947128421) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 1079526 + ... + 1080402.

Almost surely, 2^947128428 is an apocalyptic number.

It is an amenable number.

947128428 is an abundant number, since it is smaller than the sum of its proper divisors (1478574852).

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

947128428 is a wasteful number, since it uses less digits than its factorization.

947128428 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1247 (or 1242 counting only the distinct ones).

The product of its digits is 258048, while the sum is 45.

The square root of 947128428 is about 30775.4517107385. The cubic root of 947128428 is about 982.0560844465.

The spelling of 947128428 in words is "nine hundred forty-seven million, one hundred twenty-eight thousand, four hundred twenty-eight".