628971481 has 4 divisors (see below), whose sum is σ = 629022672. Its totient is φ = 628920292.

The previous prime is 628971461. The next prime is 628971487. The reversal of 628971481 is 184179826.

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 a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 628971481 - 2⁷ = 628971353 is a prime.

It is a super-2 number, since 2×628971481² = 791210247822666722, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (628971487) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5130 + ... + 35836.

It is an arithmetic number, because the mean of its divisors is an integer number (157255668).

Almost surely, 2^628971481 is an apocalyptic number.

It is an amenable number.

628971481 is a deficient number, since it is larger than the sum of its proper divisors (51191).

628971481 is a wasteful number, since it uses less digits than its factorization.

628971481 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 51190.

The product of its digits is 193536, while the sum is 46.

The square root of 628971481 is about 25079.3038380255. The cubic root of 628971481 is about 856.7951208274.

The spelling of 628971481 in words is "six hundred twenty-eight million, nine hundred seventy-one thousand, four hundred eighty-one".