428115771 has 24 divisors (see below), whose sum is σ = 652317120. Its totient is φ = 269815536.

The previous prime is 428115749. The next prime is 428115803. The reversal of 428115771 is 177511824.

428115771 is a `hidden beast` number, since 4 + 2 + 81 + 1 + 577 + 1 = 666.

It is not a de Polignac number, because 428115771 - 2⁶ = 428115707 is a prime.

It is a super-2 number, since 2×428115771² = 366566226757848882, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (428116771) 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, 87040 + ... + 91826.

It is an arithmetic number, because the mean of its divisors is an integer number (27179880).

Almost surely, 2^428115771 is an apocalyptic number.

428115771 is a deficient number, since it is larger than the sum of its proper divisors (224201349).

428115771 is a wasteful number, since it uses less digits than its factorization.

428115771 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5335 (or 5332 counting only the distinct ones).

The product of its digits is 15680, while the sum is 36.

The square root of 428115771 is about 20690.9586776447. The cubic root of 428115771 is about 753.6801471532.

The spelling of 428115771 in words is "four hundred twenty-eight million, one hundred fifteen thousand, seven hundred seventy-one".