1620730025 has 12 divisors (see below), whose sum is σ = 2010204672. Its totient is φ = 1296261840.

The previous prime is 1620730019. The next prime is 1620730049. The reversal of 1620730025 is 5200370261.

It is not a de Polignac number, because 1620730025 - 2⁴ = 1620730009 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1620729976 and 1620730003.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 191432 + ... + 199718.

It is an arithmetic number, because the mean of its divisors is an integer number (167517056).

Almost surely, 2^1620730025 is an apocalyptic number.

It is an amenable number.

1620730025 is a deficient number, since it is larger than the sum of its proper divisors (389474647).

1620730025 is an equidigital number, since it uses as much as digits as its factorization.

1620730025 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16120 (or 16115 counting only the distinct ones).

The product of its (nonzero) digits is 2520, while the sum is 26.

The square root of 1620730025 is about 40258.2913820246. The cubic root of 1620730025 is about 1174.6366826014.

The spelling of 1620730025 in words is "one billion, six hundred twenty million, seven hundred thirty thousand, twenty-five".