625721670 has 288 divisors, whose sum is σ = 2048716800. Its totient is φ = 131725440.

The previous prime is 625721653. The next prime is 625721687. The reversal of 625721670 is 76127526.

625721670 is a `hidden beast` number, since 6 + 2 + 572 + 16 + 70 = 666.

It is an interprime number because it is at equal distance from previous prime (625721653) and next prime (625721687).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 143 ways as a sum of consecutive naturals, for example, 3144231 + ... + 3144429.

It is an arithmetic number, because the mean of its divisors is an integer number (7113600).

Almost surely, 2^625721670 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 625721670, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1024358400).

625721670 is an abundant number, since it is smaller than the sum of its proper divisors (1422995130).

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

625721670 is a wasteful number, since it uses less digits than its factorization.

625721670 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 280 (or 270 counting only the distinct ones).

The product of its (nonzero) digits is 35280, while the sum is 36.

The square root of 625721670 is about 25014.4292359430. The cubic root of 625721670 is about 855.3169236520.

The spelling of 625721670 in words is "six hundred twenty-five million, seven hundred twenty-one thousand, six hundred seventy".