1620690960 has 80 divisors (see below), whose sum is σ = 5741882496. Its totient is φ = 370443264.

The previous prime is 1620690959. The next prime is 1620690961. The reversal of 1620690960 is 690960261.

It is an interprime number because it is at equal distance from previous prime (1620690959) and next prime (1620690961).

It is a tau number, because it is divible by the number of its divisors (80).

It is not an unprimeable number, because it can be changed into a prime (1620690961) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 480669 + ... + 484028.

Almost surely, 2^1620690960 is an apocalyptic number.

1620690960 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1620690960 is an abundant number, since it is smaller than the sum of its proper divisors (4121191536).

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

1620690960 is a wasteful number, since it uses less digits than its factorization.

1620690960 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 964720 (or 964714 counting only the distinct ones).

The product of its (nonzero) digits is 34992, while the sum is 39.

The square root of 1620690960 is about 40257.8061995435. The cubic root of 1620690960 is about 1174.6272449714.

The spelling of 1620690960 in words is "one billion, six hundred twenty million, six hundred ninety thousand, nine hundred sixty".