19640625 has 28 divisors (see below), whose sum is σ = 32812080. Its totient is φ = 10450000.

The previous prime is 19640603. The next prime is 19640633. The reversal of 19640625 is 52604691.

It is not a de Polignac number, because 19640625 - 2⁹ = 19640113 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 27 ways as a sum of consecutive naturals, for example, 46666 + ... + 47084.

It is an arithmetic number, because the mean of its divisors is an integer number (1171860).

Almost surely, 2^19640625 is an apocalyptic number.

19640625 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

19640625 is a deficient number, since it is larger than the sum of its proper divisors (13171455).

19640625 is an frugal number, since it uses more digits than its factorization.

19640625 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 452 (or 427 counting only the distinct ones).

The product of its (nonzero) digits is 12960, while the sum is 33.

The square root of 19640625 is about 4431.7744753090. The cubic root of 19640625 is about 269.8061022142.

The spelling of 19640625 in words is "nineteen million, six hundred forty thousand, six hundred twenty-five".