408028428821 has 8 divisors (see below), whose sum is σ = 440434761984. Its totient is φ = 375767742960.

The previous prime is 408028428817. The next prime is 408028428827. The reversal of 408028428821 is 128824820804.

It is a happy number.

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 408028428821 - 2² = 408028428817 is a prime.

It is a super-2 number, since 2×408028428821² (a number of 24 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (408028428827) 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, 36406001 + ... + 36417206.

It is an arithmetic number, because the mean of its divisors is an integer number (55054345248).

Almost surely, 2^408028428821 is an apocalyptic number.

It is an amenable number.

408028428821 is a deficient number, since it is larger than the sum of its proper divisors (32406333163).

408028428821 is a wasteful number, since it uses less digits than its factorization.

408028428821 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 72823651.

The product of its (nonzero) digits is 524288, while the sum is 47.

The spelling of 408028428821 in words is "four hundred eight billion, twenty-eight million, four hundred twenty-eight thousand, eight hundred twenty-one".