1620685950 has 96 divisors (see below), whose sum is σ = 4349054976. Its totient is φ = 397042560.

The previous prime is 1620685943. The next prime is 1620686009. The reversal of 1620685950 is 595860261.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 432987 + ... + 436713.

It is an arithmetic number, because the mean of its divisors is an integer number (45302656).

Almost surely, 2^1620685950 is an apocalyptic number.

1620685950 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is a practical number, because each smaller number is the sum of distinct divisors of 1620685950, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2174527488).

1620685950 is an abundant number, since it is smaller than the sum of its proper divisors (2728369026).

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

1620685950 is a wasteful number, since it uses less digits than its factorization.

1620685950 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3978 (or 3973 counting only the distinct ones).

The product of its (nonzero) digits is 129600, while the sum is 42.

The square root of 1620685950 is about 40257.7439755384. The cubic root of 1620685950 is about 1174.6260346053.

The spelling of 1620685950 in words is "one billion, six hundred twenty million, six hundred eighty-five thousand, nine hundred fifty".