6449780409 has 8 divisors (see below), whose sum is σ = 8896248960. Its totient is φ = 4151582736.

The previous prime is 6449780371. The next prime is 6449780411. The reversal of 6449780409 is 9040879446.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 6449780409 - 2¹⁵ = 6449747641 is a prime.

It is not an unprimeable number, because it can be changed into a prime (6449780429) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 37067617 + ... + 37067790.

It is an arithmetic number, because the mean of its divisors is an integer number (1112031120).

Almost surely, 2^6449780409 is an apocalyptic number.

It is an amenable number.

6449780409 is a deficient number, since it is larger than the sum of its proper divisors (2446468551).

6449780409 is a wasteful number, since it uses less digits than its factorization.

6449780409 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 74135439.

The product of its (nonzero) digits is 1741824, while the sum is 51.

The square root of 6449780409 is about 80310.5248955577. The cubic root of 6449780409 is about 1861.4368603063.

The spelling of 6449780409 in words is "six billion, four hundred forty-nine million, seven hundred eighty thousand, four hundred nine".