1620207825 has 12 divisors (see below), whose sum is σ = 2678743728. Its totient is φ = 864110800.

The previous prime is 1620207773. The next prime is 1620207833. The reversal of 1620207825 is 5287020261.

It is not a de Polignac number, because 1620207825 - 2⁷ = 1620207697 is a prime.

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, 10801311 + ... + 10801460.

It is an arithmetic number, because the mean of its divisors is an integer number (223228644).

Almost surely, 2^1620207825 is an apocalyptic number.

1620207825 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

1620207825 is a deficient number, since it is larger than the sum of its proper divisors (1058535903).

1620207825 is a wasteful number, since it uses less digits than its factorization.

1620207825 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21602784 (or 21602779 counting only the distinct ones).

The product of its (nonzero) digits is 13440, while the sum is 33.

The square root of 1620207825 is about 40251.8052390200. The cubic root of 1620207825 is about 1174.5105128802.

The spelling of 1620207825 in words is "one billion, six hundred twenty million, two hundred seven thousand, eight hundred twenty-five".