1928916645 has 16 divisors (see below), whose sum is σ = 3267812160. Its totient is φ = 968240384.

The previous prime is 1928916641. The next prime is 1928916673. The reversal of 1928916645 is 5466198291.

It is a cyclic number.

It is not a de Polignac number, because 1928916645 - 2² = 1928916641 is a prime.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1928916641) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 3781935 + ... + 3782444.

It is an arithmetic number, because the mean of its divisors is an integer number (204238260).

Almost surely, 2^1928916645 is an apocalyptic number.

1928916645 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

1928916645 is a deficient number, since it is larger than the sum of its proper divisors (1338895515).

1928916645 is a wasteful number, since it uses less digits than its factorization.

1928916645 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7564404.

The product of its digits is 933120, while the sum is 51.

The square root of 1928916645 is about 43919.4335687518. The cubic root of 1928916645 is about 1244.8140655541.

The spelling of 1928916645 in words is "one billion, nine hundred twenty-eight million, nine hundred sixteen thousand, six hundred forty-five".