45490644 has 18 divisors (see below), whose sum is σ = 114990330. Its totient is φ = 15163536.

The previous prime is 45490639. The next prime is 45490651. The reversal of 45490644 is 44609454.

45490644 is a `hidden beast` number, since 4 + 5 + 4 + 9 + 0 + 644 = 666.

It can be written as a sum of positive squares in only one way, i.e., 45400644 + 90000 = 6738^2 + 300^2 .

It is a tau number, because it is divible by the number of its divisors (18).

It is a Harshad number since it is a multiple of its sum of digits (36), and also a Moran number because the ratio is a prime number: 1263629 = 45490644 / (4 + 5 + 4 + 9 + 0 + 6 + 4 + 4).

It is a junction number, because it is equal to n+sod(n) for n = 45490599 and 45490608.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 631779 + ... + 631850.

Almost surely, 2^45490644 is an apocalyptic number.

It is an amenable number.

45490644 is an abundant number, since it is smaller than the sum of its proper divisors (69499686).

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

45490644 is a wasteful number, since it uses less digits than its factorization.

45490644 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1263639 (or 1263634 counting only the distinct ones).

The product of its (nonzero) digits is 69120, while the sum is 36.

The square root of 45490644 is about 6744.6752331006. The cubic root of 45490644 is about 356.9773777535.

The spelling of 45490644 in words is "forty-five million, four hundred ninety thousand, six hundred forty-four".