1728379545 has 16 divisors (see below), whose sum is σ = 2928078720. Its totient is φ = 867578624.

The previous prime is 1728379531. The next prime is 1728379567. The reversal of 1728379545 is 5459738271.

It is a cyclic number.

It is not a de Polignac number, because 1728379545 - 2⁴ = 1728379529 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (51).

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 3388725 + ... + 3389234.

It is an arithmetic number, because the mean of its divisors is an integer number (183004920).

Almost surely, 2^1728379545 is an apocalyptic number.

1728379545 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

1728379545 is a deficient number, since it is larger than the sum of its proper divisors (1199699175).

1728379545 is a wasteful number, since it uses less digits than its factorization.

1728379545 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6777984.

The product of its digits is 2116800, while the sum is 51.

The square root of 1728379545 is about 41573.7843478315. The cubic root of 1728379545 is about 1200.0878512072.

The spelling of 1728379545 in words is "one billion, seven hundred twenty-eight million, three hundred seventy-nine thousand, five hundred forty-five".