1645094772 has 60 divisors (see below), whose sum is σ = 4381791876. Its totient is φ = 538012800.

The previous prime is 1645094761. The next prime is 1645094797. The reversal of 1645094772 is 2774905461.

It can be written as a sum of positive squares in 2 ways, for example, as 1210622436 + 434472336 = 34794^2 + 20844^2 .

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 30729 + ... + 65072.

Almost surely, 2^1645094772 is an apocalyptic number.

1645094772 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

1645094772 is an abundant number, since it is smaller than the sum of its proper divisors (2736697104).

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

1645094772 is a wasteful number, since it uses less digits than its factorization.

1645094772 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 95870 (or 95859 counting only the distinct ones).

The product of its (nonzero) digits is 423360, while the sum is 45.

The square root of 1645094772 is about 40559.7678987442. The cubic root of 1645094772 is about 1180.4936103980.

The spelling of 1645094772 in words is "one billion, six hundred forty-five million, ninety-four thousand, seven hundred seventy-two".