1228405672 has 64 divisors (see below), whose sum is σ = 2520967680. Its totient is φ = 557770752.

The previous prime is 1228405667. The next prime is 1228405699. The reversal of 1228405672 is 2765048221.

It is a happy number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2652913 + ... + 2653375.

It is an arithmetic number, because the mean of its divisors is an integer number (39390120).

Almost surely, 2^1228405672 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1228405672, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1260483840).

1228405672 is an abundant number, since it is smaller than the sum of its proper divisors (1292562008).

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

1228405672 is a wasteful number, since it uses less digits than its factorization.

1228405672 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 842 (or 838 counting only the distinct ones).

The product of its (nonzero) digits is 53760, while the sum is 37.

The square root of 1228405672 is about 35048.6186889013. The cubic root of 1228405672 is about 1070.9781348891.

The spelling of 1228405672 in words is "one billion, two hundred twenty-eight million, four hundred five thousand, six hundred seventy-two".