45078021 has 12 divisors (see below), whose sum is σ = 65173420. Its totient is φ = 30024000.

The previous prime is 45077993. The next prime is 45078031. The reversal of 45078021 is 12087054.

It can be written as a sum of positive squares in 2 ways, for example, as 24147396 + 20930625 = 4914^2 + 4575^2 .

It is not a de Polignac number, because 45078021 - 2¹¹ = 45075973 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (45078031) 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, 13521 + ... + 16521.

Almost surely, 2^45078021 is an apocalyptic number.

It is an amenable number.

45078021 is a deficient number, since it is larger than the sum of its proper divisors (20095399).

45078021 is a wasteful number, since it uses less digits than its factorization.

45078021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4676 (or 4673 counting only the distinct ones).

The product of its (nonzero) digits is 2240, while the sum is 27.

The square root of 45078021 is about 6714.0167560113. The cubic root of 45078021 is about 355.8947764810.

The spelling of 45078021 in words is "forty-five million, seventy-eight thousand, twenty-one".