428737731 has 4 divisors (see below), whose sum is σ = 571650312. Its totient is φ = 285825152.

The previous prime is 428737703. The next prime is 428737741. The reversal of 428737731 is 137737824.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 428737731 - 2⁶ = 428737667 is a prime.

It is a super-2 number, since 2×428737731² = 367632083966056722, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (428737741) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 71456286 + ... + 71456291.

It is an arithmetic number, because the mean of its divisors is an integer number (142912578).

Almost surely, 2^428737731 is an apocalyptic number.

428737731 is a deficient number, since it is larger than the sum of its proper divisors (142912581).

428737731 is a wasteful number, since it uses less digits than its factorization.

428737731 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 142912580.

The product of its digits is 197568, while the sum is 42.

The square root of 428737731 is about 20705.9829759420. The cubic root of 428737731 is about 754.0449488550.

The spelling of 428737731 in words is "four hundred twenty-eight million, seven hundred thirty-seven thousand, seven hundred thirty-one".