401822728 has 8 divisors (see below), whose sum is σ = 753417630. Its totient is φ = 200911360.

The previous prime is 401822717. The next prime is 401822747. The reversal of 401822728 is 827228104.

It can be written as a sum of positive squares in only one way, i.e., 220166244 + 181656484 = 14838^2 + 13478^2 .

It is a tau number, because it is divible by the number of its divisors (8).

It is a super-2 number, since 2×401822728² = 322923009474723968, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 401822693 and 401822702.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 25113913 + ... + 25113928.

Almost surely, 2^401822728 is an apocalyptic number.

It is an amenable number.

401822728 is a deficient number, since it is larger than the sum of its proper divisors (351594902).

401822728 is a wasteful number, since it uses less digits than its factorization.

401822728 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 50227847 (or 50227843 counting only the distinct ones).

The product of its (nonzero) digits is 14336, while the sum is 34.

The square root of 401822728 is about 20045.5164064187. The cubic root of 401822728 is about 737.9237686357.

The spelling of 401822728 in words is "four hundred one million, eight hundred twenty-two thousand, seven hundred twenty-eight".