5451778728 has 48 divisors (see below), whose sum is σ = 16107530400. Its totient is φ = 1652053920.

The previous prime is 5451778691. The next prime is 5451778741. The reversal of 5451778728 is 8278771545.

5451778728 is a `hidden beast` number, since 54 + 517 + 7 + 8 + 72 + 8 = 666.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 3440988 + ... + 3442571.

It is an arithmetic number, because the mean of its divisors is an integer number (335573550).

Almost surely, 2^5451778728 is an apocalyptic number.

It is an amenable number.

5451778728 is an abundant number, since it is smaller than the sum of its proper divisors (10655751672).

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

5451778728 is a wasteful number, since it uses less digits than its factorization.

5451778728 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6883582 (or 6883575 counting only the distinct ones).

The product of its digits is 4390400, while the sum is 54.

The square root of 5451778728 is about 73836.1613845140. The cubic root of 5451778728 is about 1760.0002935606. Note that the first 3 decimals are identical.

The spelling of 5451778728 in words is "five billion, four hundred fifty-one million, seven hundred seventy-eight thousand, seven hundred twenty-eight".