625505979 has 16 divisors (see below), whose sum is σ = 978914048. Its totient is φ = 347771232.

The previous prime is 625505971. The next prime is 625506001. The reversal of 625505979 is 979505526.

It is a happy number.

It is not a de Polignac number, because 625505979 - 2³ = 625505971 is a prime.

It is a super-4 number, since 4×625505979⁴ (a number of 36 digits) contains 4444 as substring.

It is not an unprimeable number, because it can be changed into a prime (625505971) 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, 401737 + ... + 403290.

It is an arithmetic number, because the mean of its divisors is an integer number (61182128).

Almost surely, 2^625505979 is an apocalyptic number.

625505979 is a deficient number, since it is larger than the sum of its proper divisors (353408069).

625505979 is a wasteful number, since it uses less digits than its factorization.

625505979 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 805074.

The product of its (nonzero) digits is 850500, while the sum is 48.

The square root of 625505979 is about 25010.1175327106. The cubic root of 625505979 is about 855.2186342830.

The spelling of 625505979 in words is "six hundred twenty-five million, five hundred five thousand, nine hundred seventy-nine".