5451449640 has 256 divisors, whose sum is σ = 20431595520. Its totient is φ = 1132876800.

The previous prime is 5451449623. The next prime is 5451449669. The reversal of 5451449640 is 469441545.

It is a super-2 number, since 2×5451449640² = 59436606354912259200, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (42).

It is a junction number, because it is equal to n+sod(n) for n = 5451449592 and 5451449601.

It is an unprimeable number.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 727915 + ... + 735365.

It is an arithmetic number, because the mean of its divisors is an integer number (79810920).

Almost surely, 2^5451449640 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 5451449640, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (10215797760).

5451449640 is an abundant number, since it is smaller than the sum of its proper divisors (14980145880).

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

5451449640 is a wasteful number, since it uses less digits than its factorization.

5451449640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7552 (or 7548 counting only the distinct ones).

The product of its (nonzero) digits is 345600, while the sum is 42.

The square root of 5451449640 is about 73833.9328493343. The cubic root of 5451449640 is about 1759.9648796367.

The spelling of 5451449640 in words is "five billion, four hundred fifty-one million, four hundred forty-nine thousand, six hundred forty".