1928857640 has 32 divisors (see below), whose sum is σ = 4404710880. Its totient is φ = 760026432.

The previous prime is 1928857607. The next prime is 1928857687. The reversal of 1928857640 is 467588291.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 357182 + ... + 362541.

It is an arithmetic number, because the mean of its divisors is an integer number (137647215).

Almost surely, 2^1928857640 is an apocalyptic number.

1928857640 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1928857640 is an abundant number, since it is smaller than the sum of its proper divisors (2475853240).

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

1928857640 is a wasteful number, since it uses less digits than its factorization.

1928857640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 719801 (or 719797 counting only the distinct ones).

The product of its (nonzero) digits is 967680, while the sum is 50.

The square root of 1928857640 is about 43918.7618222554. The cubic root of 1928857640 is about 1244.8013725911.

The spelling of 1928857640 in words is "one billion, nine hundred twenty-eight million, eight hundred fifty-seven thousand, six hundred forty".