449747640 has 160 divisors (see below), whose sum is σ = 1524948480. Its totient is φ = 118879488.

The previous prime is 449747629. The next prime is 449747657. The reversal of 449747640 is 46747944.

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

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 410934 + ... + 412026.

It is an arithmetic number, because the mean of its divisors is an integer number (9530928).

Almost surely, 2^449747640 is an apocalyptic number.

449747640 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 449747640, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (762474240).

449747640 is an abundant number, since it is smaller than the sum of its proper divisors (1075200840).

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

449747640 is a wasteful number, since it uses less digits than its factorization.

449747640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1243 (or 1230 counting only the distinct ones).

The product of its (nonzero) digits is 677376, while the sum is 45.

The square root of 449747640 is about 21207.2544191840. The cubic root of 449747640 is about 766.1661568307.

The spelling of 449747640 in words is "four hundred forty-nine million, seven hundred forty-seven thousand, six hundred forty".