45989640 has 128 divisors (see below), whose sum is σ = 155232000. Its totient is φ = 12109824.

The previous prime is 45989639. The next prime is 45989653. The reversal of 45989640 is 4698954.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 104541 + ... + 104979.

It is an arithmetic number, because the mean of its divisors is an integer number (1212750).

Almost surely, 2^45989640 is an apocalyptic number.

45989640 is a gapful number since it is divisible by the number (40) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 45989640, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (77616000).

45989640 is an abundant number, since it is smaller than the sum of its proper divisors (109242360).

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

45989640 is a wasteful number, since it uses less digits than its factorization.

45989640 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 556 (or 546 counting only the distinct ones).

The product of its (nonzero) digits is 311040, while the sum is 45.

The square root of 45989640 is about 6781.5661907851. The cubic root of 45989640 is about 358.2778862588.

The spelling of 45989640 in words is "forty-five million, nine hundred eighty-nine thousand, six hundred forty".