1628651380 has 24 divisors (see below), whose sum is σ = 3420927720. Its totient is φ = 651315840.

The previous prime is 1628651351. The next prime is 1628651411. The reversal of 1628651380 is 831568261.

It can be written as a sum of positive squares in 4 ways, for example, as 97337956 + 1531313424 = 9866^2 + 39132^2 .

It is a congruent number.

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, 163750 + ... + 173410.

It is an arithmetic number, because the mean of its divisors is an integer number (142538655).

Almost surely, 2^1628651380 is an apocalyptic number.

1628651380 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1628651380 is an abundant number, since it is smaller than the sum of its proper divisors (1792276340).

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

1628651380 is a wasteful number, since it uses less digits than its factorization.

1628651380 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18099 (or 18097 counting only the distinct ones).

The product of its (nonzero) digits is 69120, while the sum is 40.

The square root of 1628651380 is about 40356.5531233776. The cubic root of 1628651380 is about 1176.5472611765.

The spelling of 1628651380 in words is "one billion, six hundred twenty-eight million, six hundred fifty-one thousand, three hundred eighty".