1045273644 has 72 divisors (see below), whose sum is σ = 2706631200. Its totient is φ = 340032000.

The previous prime is 1045273609. The next prime is 1045273673. The reversal of 1045273644 is 4463725401.

1045273644 is a `hidden beast` number, since 1 + 0 + 4 + 5 + 2 + 7 + 3 + 644 = 666.

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 = 1045273599 and 1045273608.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 256132 + ... + 260180.

It is an arithmetic number, because the mean of its divisors is an integer number (37592100).

Almost surely, 2^1045273644 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 1045273644, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1353315600).

1045273644 is an abundant number, since it is smaller than the sum of its proper divisors (1661357556).

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

1045273644 is a wasteful number, since it uses less digits than its factorization.

1045273644 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4231 (or 4226 counting only the distinct ones).

The product of its (nonzero) digits is 80640, while the sum is 36.

The square root of 1045273644 is about 32330.6919814594. The cubic root of 1045273644 is about 1014.8690308012.

The spelling of 1045273644 in words is "one billion, forty-five million, two hundred seventy-three thousand, six hundred forty-four".