628750039 has 2 divisors, whose sum is σ = 628750040. Its totient is φ = 628750038.

The previous prime is 628750021. The next prime is 628750093. The reversal of 628750039 is 930057826.

Together with next prime (628750093) it forms an Ormiston pair, because they use the same digits, order apart.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 628750039 - 2²⁵ = 595195607 is a prime.

It is a super-2 number, since 2×628750039² = 790653223085003042, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 628749983 and 628750010.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (628750099) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 314375019 + 314375020.

It is an arithmetic number, because the mean of its divisors is an integer number (314375020).

Almost surely, 2^628750039 is an apocalyptic number.

628750039 is a deficient number, since it is larger than the sum of its proper divisors (1).

628750039 is an equidigital number, since it uses as much as digits as its factorization.

628750039 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 90720, while the sum is 40.

The square root of 628750039 is about 25074.8886139101. Note that the first 3 decimals coincide. The cubic root of 628750039 is about 856.6945584005.

The spelling of 628750039 in words is "six hundred twenty-eight million, seven hundred fifty thousand, thirty-nine".