1620466320 has 80 divisors (see below), whose sum is σ = 5480131392. Its totient is φ = 392839680.

The previous prime is 1620466313. The next prime is 1620466327. The reversal of 1620466320 is 236640261.

It is an interprime number because it is at equal distance from previous prime (1620466313) and next prime (1620466327).

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

It is a super-2 number, since 2×1620466320² = 5251822188508684800, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (30).

It is not an unprimeable number, because it can be changed into a prime (1620466327) 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, 304267 + ... + 309546.

Almost surely, 2^1620466320 is an apocalyptic number.

1620466320 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1620466320 is an abundant number, since it is smaller than the sum of its proper divisors (3859665072).

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

1620466320 is a wasteful number, since it uses less digits than its factorization.

1620466320 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 613840 (or 613834 counting only the distinct ones).

The product of its (nonzero) digits is 10368, while the sum is 30.

The square root of 1620466320 is about 40255.0160849552. The cubic root of 1620466320 is about 1174.5729717297.

The spelling of 1620466320 in words is "one billion, six hundred twenty million, four hundred sixty-six thousand, three hundred twenty".