628786401 has 4 divisors (see below), whose sum is σ = 838381872. Its totient is φ = 419190932.

The previous prime is 628786369. The next prime is 628786409. The reversal of 628786401 is 104687826.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 628786401 - 2⁵ = 628786369 is a prime.

It is not an unprimeable number, because it can be changed into a prime (628786409) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 104797731 + ... + 104797736.

It is an arithmetic number, because the mean of its divisors is an integer number (209595468).

Almost surely, 2^628786401 is an apocalyptic number.

It is an amenable number.

628786401 is a deficient number, since it is larger than the sum of its proper divisors (209595471).

628786401 is a wasteful number, since it uses less digits than its factorization.

628786401 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 209595470.

The product of its (nonzero) digits is 129024, while the sum is 42.

The square root of 628786401 is about 25075.6136714538. The cubic root of 628786401 is about 856.7110729268.

The spelling of 628786401 in words is "six hundred twenty-eight million, seven hundred eighty-six thousand, four hundred one".