1621317960 has 48 divisors (see below), whose sum is σ = 5269284540. Its totient is φ = 432351360.

The previous prime is 1621317917. The next prime is 1621317961. The reversal of 1621317960 is 697131261.

It can be written as a sum of positive squares in 2 ways, for example, as 1577201796 + 44116164 = 39714^2 + 6642^2 .

It is a Harshad number since it is a multiple of its sum of digits (36).

It is not an unprimeable number, because it can be changed into a prime (1621317961) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 2251471 + ... + 2252190.

Almost surely, 2^1621317960 is an apocalyptic number.

1621317960 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1621317960 is an abundant number, since it is smaller than the sum of its proper divisors (3647966580).

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

1621317960 is a wasteful number, since it uses less digits than its factorization.

1621317960 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4503678 (or 4503671 counting only the distinct ones).

The product of its (nonzero) digits is 13608, while the sum is 36.

The square root of 1621317960 is about 40265.5927560988. The cubic root of 1621317960 is about 1174.7787022501.

The spelling of 1621317960 in words is "one billion, six hundred twenty-one million, three hundred seventeen thousand, nine hundred sixty".