661429428 has 48 divisors (see below), whose sum is σ = 1686042624. Its totient is φ = 200147040.

The previous prime is 661429367. The next prime is 661429451. The reversal of 661429428 is 824924166.

It is a self number, because there is not a number n which added to its sum of digits gives 661429428.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 100701 + ... + 107067.

It is an arithmetic number, because the mean of its divisors is an integer number (35125888).

Almost surely, 2^661429428 is an apocalyptic number.

It is an amenable number.

661429428 is an abundant number, since it is smaller than the sum of its proper divisors (1024613196).

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

661429428 is a wasteful number, since it uses less digits than its factorization.

661429428 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7172 (or 7170 counting only the distinct ones).

The product of its digits is 165888, while the sum is 42.

The square root of 661429428 is about 25718.2703150892. The cubic root of 661429428 is about 871.2868734733.

The spelling of 661429428 in words is "six hundred sixty-one million, four hundred twenty-nine thousand, four hundred twenty-eight".