1928978051 has 48 divisors (see below), whose sum is σ = 2680015968. Its totient is φ = 1364428800.

The previous prime is 1928978041. The next prime is 1928978081. The reversal of 1928978051 is 1508798291.

It is a de Polignac number, because none of the positive numbers 2^k-1928978051 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1928978041) 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 47 ways as a sum of consecutive naturals, for example, 425171 + ... + 429683.

It is an arithmetic number, because the mean of its divisors is an integer number (55833666).

Almost surely, 2^1928978051 is an apocalyptic number.

1928978051 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

1928978051 is a deficient number, since it is larger than the sum of its proper divisors (751037917).

1928978051 is a wasteful number, since it uses less digits than its factorization.

1928978051 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4612 (or 4605 counting only the distinct ones).

The product of its (nonzero) digits is 362880, while the sum is 50.

The square root of 1928978051 is about 43920.1326386886. The cubic root of 1928978051 is about 1244.8272747375.

It can be divided in two parts, 1928 and 978051, that added together give a palindrome (979979).

The spelling of 1928978051 in words is "one billion, nine hundred twenty-eight million, nine hundred seventy-eight thousand, fifty-one".