45123640 has 16 divisors (see below), whose sum is σ = 101528280. Its totient is φ = 18049440.

The previous prime is 45123599. The next prime is 45123643. The reversal of 45123640 is 4632154.

It is a super-2 number, since 2×45123640² = 4072285773699200, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (45123643) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 564006 + ... + 564085.

Almost surely, 2^45123640 is an apocalyptic number.

45123640 is a gapful number since it is divisible by the number (40) formed by its first and last digit.

It is an amenable number.

45123640 is an abundant number, since it is smaller than the sum of its proper divisors (56404640).

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

45123640 is a wasteful number, since it uses less digits than its factorization.

45123640 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1128102 (or 1128098 counting only the distinct ones).

The product of its (nonzero) digits is 2880, while the sum is 25.

The square root of 45123640 is about 6717.4131925913. The cubic root of 45123640 is about 356.0147912888.

Adding to 45123640 its reverse (4632154), we get a palindrome (49755794).

The spelling of 45123640 in words is "forty-five million, one hundred twenty-three thousand, six hundred forty".