45043840 has 32 divisors (see below), whose sum is σ = 107684460. Its totient is φ = 18017280.

The previous prime is 45043807. The next prime is 45043877. The reversal of 45043840 is 4834054.

It can be written as a sum of positive squares in 2 ways, for example, as 43771456 + 1272384 = 6616^2 + 1128^2 .

It is a tau number, because it is divible by the number of its divisors (32).

It is a junction number, because it is equal to n+sod(n) for n = 45043799 and 45043808.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 34551 + ... + 35830.

Almost surely, 2^45043840 is an apocalyptic number.

45043840 is a gapful number since it is divisible by the number (40) formed by its first and last digit.

It is an amenable number.

45043840 is an abundant number, since it is smaller than the sum of its proper divisors (62640620).

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

45043840 is an equidigital number, since it uses as much as digits as its factorization.

45043840 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 70400 (or 70388 counting only the distinct ones).

The product of its (nonzero) digits is 7680, while the sum is 28.

The square root of 45043840 is about 6711.4707777059. The cubic root of 45043840 is about 355.8047997762.

Adding to 45043840 its reverse (4834054), we get a palindrome (49877894).

The spelling of 45043840 in words is "forty-five million, forty-three thousand, eight hundred forty".