19406728965 has 64 divisors (see below), whose sum is σ = 34835834880. Its totient is φ = 9160750080.

The previous prime is 19406728937. The next prime is 19406728967. The reversal of 19406728965 is 56982760491.

It is not a de Polignac number, because 19406728965 - 2⁵ = 19406728933 is a prime.

It is a super-2 number, since 2×19406728965² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (19406728967) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 644179 + ... + 673631.

It is an arithmetic number, because the mean of its divisors is an integer number (544309920).

Almost surely, 2^19406728965 is an apocalyptic number.

19406728965 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

19406728965 is a deficient number, since it is larger than the sum of its proper divisors (15429105915).

19406728965 is a wasteful number, since it uses less digits than its factorization.

19406728965 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 29614.

The product of its (nonzero) digits is 6531840, while the sum is 57.

The spelling of 19406728965 in words is "nineteen billion, four hundred six million, seven hundred twenty-eight thousand, nine hundred sixty-five".