625643401 has 16 divisors (see below), whose sum is σ = 695952000. Its totient is φ = 559406848.

The previous prime is 625643399. The next prime is 625643407. The reversal of 625643401 is 104346526.

It is a cyclic number.

It is not a de Polignac number, because 625643401 - 2¹ = 625643399 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (625643407) 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, 52890 + ... + 63628.

It is an arithmetic number, because the mean of its divisors is an integer number (43497000).

Almost surely, 2^625643401 is an apocalyptic number.

It is an amenable number.

625643401 is a deficient number, since it is larger than the sum of its proper divisors (70308599).

625643401 is a wasteful number, since it uses less digits than its factorization.

625643401 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10928.

The product of its (nonzero) digits is 17280, while the sum is 31.

The square root of 625643401 is about 25012.8647099847. The cubic root of 625643401 is about 855.2812594501.

Adding to 625643401 its reverse (104346526), we get a palindrome (729989927).

The spelling of 625643401 in words is "six hundred twenty-five million, six hundred forty-three thousand, four hundred one".