400451561028 has 36 divisors (see below), whose sum is σ = 1056263539968. Its totient is φ = 127680207600.

The previous prime is 400451561023. The next prime is 400451561063. The reversal of 400451561028 is 820165154004.

It is a happy number.

400451561028 is a `hidden beast` number, since 4 + 0 + 0 + 4 + 5 + 15 + 610 + 28 = 666.

It is a tau number, because it is divible by the number of its divisors (36).

It is a super-2 number, since 2×400451561028² (a number of 24 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a junction number, because it is equal to n+sod(n) for n = 400451560983 and 400451561001.

It is not an unprimeable number, because it can be changed into a prime (400451561023) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 241817748 + ... + 241819403.

It is an arithmetic number, because the mean of its divisors is an integer number (29340653888).

Almost surely, 2^400451561028 is an apocalyptic number.

It is an amenable number.

400451561028 is an abundant number, since it is smaller than the sum of its proper divisors (655811978940).

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

400451561028 is a wasteful number, since it uses less digits than its factorization.

400451561028 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 483637184 (or 483637179 counting only the distinct ones).

The product of its (nonzero) digits is 38400, while the sum is 36.

The spelling of 400451561028 in words is "four hundred billion, four hundred fifty-one million, five hundred sixty-one thousand, twenty-eight".