1891343628 has 48 divisors (see below), whose sum is σ = 4958604000. Its totient is φ = 623361024.

The previous prime is 1891343627. The next prime is 1891343639. The reversal of 1891343628 is 8263431981.

1891343628 is a `hidden beast` number, since 1 + 8 + 9 + 13 + 4 + 3 + 628 = 666.

It is not an unprimeable number, because it can be changed into a prime (1891343627) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 88773 + ... + 107996.

It is an arithmetic number, because the mean of its divisors is an integer number (103304250).

Almost surely, 2^1891343628 is an apocalyptic number.

1891343628 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

It is an amenable number.

1891343628 is an abundant number, since it is smaller than the sum of its proper divisors (3067260372).

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

1891343628 is a wasteful number, since it uses less digits than its factorization.

1891343628 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 196871 (or 196863 counting only the distinct ones).

The product of its digits is 248832, while the sum is 45.

The square root of 1891343628 is about 43489.5806831935. The cubic root of 1891343628 is about 1236.6785085997.

The spelling of 1891343628 in words is "one billion, eight hundred ninety-one million, three hundred forty-three thousand, six hundred twenty-eight".