544421640 has 128 divisors (see below), whose sum is σ = 1931040000. Its totient is φ = 120142848.

The previous prime is 544421639. The next prime is 544421677. The reversal of 544421640 is 46124445.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (30).

It is a junction number, because it is equal to n+sod(n) for n = 544421598 and 544421607.

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, 13186 + ... + 35534.

It is an arithmetic number, because the mean of its divisors is an integer number (15086250).

Almost surely, 2^544421640 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 544421640, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (965520000).

544421640 is an abundant number, since it is smaller than the sum of its proper divisors (1386618360).

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

544421640 is a wasteful number, since it uses less digits than its factorization.

544421640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 22399 (or 22395 counting only the distinct ones).

The product of its (nonzero) digits is 15360, while the sum is 30.

The square root of 544421640 is about 23332.8446615495. The cubic root of 544421640 is about 816.5418714395.

The spelling of 544421640 in words is "five hundred forty-four million, four hundred twenty-one thousand, six hundred forty".