45531540 has 72 divisors (see below), whose sum is σ = 138666528. Its totient is φ = 12093120.

The previous prime is 45531527. The next prime is 45531547. The reversal of 45531540 is 4513554.

It is a super-2 number, since 2×45531540² = 4146242269543200, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (45531547) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 79455 + ... + 80025.

It is an arithmetic number, because the mean of its divisors is an integer number (1925924).

Almost surely, 2^45531540 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 45531540, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (69333264).

45531540 is an abundant number, since it is smaller than the sum of its proper divisors (93134988).

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

45531540 is a wasteful number, since it uses less digits than its factorization.

45531540 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1029 (or 1024 counting only the distinct ones).

The product of its (nonzero) digits is 6000, while the sum is 27.

The square root of 45531540 is about 6747.7062769507. The cubic root of 45531540 is about 357.0843197012.

The spelling of 45531540 in words is "forty-five million, five hundred thirty-one thousand, five hundred forty".