428440390538 has 8 divisors (see below), whose sum is σ = 680464149732. Its totient is φ = 201619007296.

The previous prime is 428440390537. The next prime is 428440390601. The reversal of 428440390538 is 835093044824.

It can be written as a sum of positive squares in 2 ways, for example, as 344678190649 + 83762199889 = 587093^2 + 289417^2 .

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

It is a super-3 number, since 3×428440390538³ (a number of 36 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is not an unprimeable number, because it can be changed into a prime (428440390537) 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, 6300593945 + ... + 6300594012.

Almost surely, 2^428440390538 is an apocalyptic number.

428440390538 is a deficient number, since it is larger than the sum of its proper divisors (252023759194).

428440390538 is a wasteful number, since it uses less digits than its factorization.

428440390538 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12601187976.

The product of its (nonzero) digits is 3317760, while the sum is 50.

The spelling of 428440390538 in words is "four hundred twenty-eight billion, four hundred forty million, three hundred ninety thousand, five hundred thirty-eight".