1620957380 has 24 divisors (see below), whose sum is σ = 3890298048. Its totient is φ = 555756768.

The previous prime is 1620957379. The next prime is 1620957433. The reversal of 1620957380 is 837590261.

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, 5788994 + ... + 5789273.

It is an arithmetic number, because the mean of its divisors is an integer number (162095752).

Almost surely, 2^1620957380 is an apocalyptic number.

1620957380 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1620957380 is an abundant number, since it is smaller than the sum of its proper divisors (2269340668).

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

1620957380 is a wasteful number, since it uses less digits than its factorization.

1620957380 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11578283 (or 11578281 counting only the distinct ones).

The product of its (nonzero) digits is 90720, while the sum is 41.

The square root of 1620957380 is about 40261.1149870443. The cubic root of 1620957380 is about 1174.6916058010.

The spelling of 1620957380 in words is "one billion, six hundred twenty million, nine hundred fifty-seven thousand, three hundred eighty".