625581606 has 32 divisors (see below), whose sum is σ = 1426668768. Its totient is φ = 181163520.

The previous prime is 625581601. The next prime is 625581611. The reversal of 625581606 is 606185526.

It is an interprime number because it is at equal distance from previous prime (625581601) and next prime (625581611).

It is a Harshad number since it is a multiple of its sum of digits (39).

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (625581601) 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, 234565 + ... + 237216.

It is an arithmetic number, because the mean of its divisors is an integer number (44583399).

Almost surely, 2^625581606 is an apocalyptic number.

625581606 is an abundant number, since it is smaller than the sum of its proper divisors (801087162).

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

625581606 is a wasteful number, since it uses less digits than its factorization.

625581606 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 471816.

The product of its (nonzero) digits is 86400, while the sum is 39.

The square root of 625581606 is about 25011.6294151341. The cubic root of 625581606 is about 855.2530997213.

The spelling of 625581606 in words is "six hundred twenty-five million, five hundred eighty-one thousand, six hundred six".