1628667920 has 40 divisors (see below), whose sum is σ = 4130896320. Its totient is φ = 592242560.

The previous prime is 1628667913. The next prime is 1628667941. The reversal of 1628667920 is 297668261.

It is a tau number, because it is divible by the number of its divisors (40).

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, 924500 + ... + 926259.

It is an arithmetic number, because the mean of its divisors is an integer number (103272408).

Almost surely, 2^1628667920 is an apocalyptic number.

1628667920 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1628667920 is an abundant number, since it is smaller than the sum of its proper divisors (2502228400).

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

1628667920 is a wasteful number, since it uses less digits than its factorization.

1628667920 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1850783 (or 1850777 counting only the distinct ones).

The product of its (nonzero) digits is 435456, while the sum is 47.

The square root of 1628667920 is about 40356.7580462058. The cubic root of 1628667920 is about 1176.5512440272.

The spelling of 1628667920 in words is "one billion, six hundred twenty-eight million, six hundred sixty-seven thousand, nine hundred twenty".