428057661 has 8 divisors (see below), whose sum is σ = 590424480. Its totient is φ = 275531312.

The previous prime is 428057657. The next prime is 428057677. The reversal of 428057661 is 166750824.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 428057661 - 2² = 428057657 is a prime.

It is a super-3 number, since 3×428057661³ (a number of 27 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (428057611) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2460015 + ... + 2460188.

It is an arithmetic number, because the mean of its divisors is an integer number (73803060).

Almost surely, 2^428057661 is an apocalyptic number.

It is an amenable number.

428057661 is a deficient number, since it is larger than the sum of its proper divisors (162366819).

428057661 is a wasteful number, since it uses less digits than its factorization.

428057661 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4920235.

The product of its (nonzero) digits is 80640, while the sum is 39.

The square root of 428057661 is about 20689.5543934615. The cubic root of 428057661 is about 753.6460455246.

The spelling of 428057661 in words is "four hundred twenty-eight million, fifty-seven thousand, six hundred sixty-one".