420625687 has 2 divisors, whose sum is σ = 420625688. Its totient is φ = 420625686.

The previous prime is 420625669. The next prime is 420625693. The reversal of 420625687 is 786526024.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-420625687 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (420625697) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 210312843 + 210312844.

It is an arithmetic number, because the mean of its divisors is an integer number (210312844).

Almost surely, 2^420625687 is an apocalyptic number.

420625687 is a deficient number, since it is larger than the sum of its proper divisors (1).

420625687 is an equidigital number, since it uses as much as digits as its factorization.

420625687 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 161280, while the sum is 40.

The square root of 420625687 is about 20509.1610506135. The cubic root of 420625687 is about 749.2589343739.

The spelling of 420625687 in words is "four hundred twenty million, six hundred twenty-five thousand, six hundred eighty-seven".