628647493 has 4 divisors (see below), whose sum is σ = 629050240. Its totient is φ = 628244748.

The previous prime is 628647491. The next prime is 628647497. The reversal of 628647493 is 394746826.

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, and also an emirpimes, since its reverse is a distinct semiprime: 394746826 = 2 ⋅197373413.

It is a cyclic number.

It is not a de Polignac number, because 628647493 - 2¹ = 628647491 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (628647491) 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, 199023 + ... + 202156.

It is an arithmetic number, because the mean of its divisors is an integer number (157262560).

Almost surely, 2^628647493 is an apocalyptic number.

It is an amenable number.

628647493 is a deficient number, since it is larger than the sum of its proper divisors (402747).

628647493 is a wasteful number, since it uses less digits than its factorization.

628647493 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 402746.

The product of its digits is 1741824, while the sum is 49.

The square root of 628647493 is about 25072.8437358031. The cubic root of 628647493 is about 856.6479816630.

The spelling of 628647493 in words is "six hundred twenty-eight million, six hundred forty-seven thousand, four hundred ninety-three".