45090390 has 64 divisors (see below), whose sum is σ = 111891456. Its totient is φ = 11622912.

The previous prime is 45090379. The next prime is 45090391. The reversal of 45090390 is 9309054.

It is a Harshad number since it is a multiple of its sum of digits (30).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (45090391) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 159189 + ... + 159471.

It is an arithmetic number, because the mean of its divisors is an integer number (1748304).

Almost surely, 2^45090390 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 45090390, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (55945728).

45090390 is an abundant number, since it is smaller than the sum of its proper divisors (66801066).

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

45090390 is a wasteful number, since it uses less digits than its factorization.

45090390 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 453.

The product of its (nonzero) digits is 4860, while the sum is 30.

The square root of 45090390 is about 6714.9378254754. The cubic root of 45090390 is about 355.9273249368.

The spelling of 45090390 in words is "forty-five million, ninety thousand, three hundred ninety".