628153865 has 4 divisors (see below), whose sum is σ = 753784644. Its totient is φ = 502523088.

The previous prime is 628153849. The next prime is 628153873. The reversal of 628153865 is 568351826.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 254466304 + 373687561 = 15952^2 + 19331^2 .

It is a cyclic number.

It is not a de Polignac number, because 628153865 - 2⁴ = 628153849 is a prime.

It is a super-2 number, since 2×628153865² = 789154556228876450, which contains 22 as substring.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 62815382 + ... + 62815391.

It is an arithmetic number, because the mean of its divisors is an integer number (188446161).

Almost surely, 2^628153865 is an apocalyptic number.

It is an amenable number.

628153865 is a deficient number, since it is larger than the sum of its proper divisors (125630779).

628153865 is a wasteful number, since it uses less digits than its factorization.

628153865 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 125630778.

The product of its digits is 345600, while the sum is 44.

The square root of 628153865 is about 25062.9979252283. The cubic root of 628153865 is about 856.4237032643.

The spelling of 628153865 in words is "six hundred twenty-eight million, one hundred fifty-three thousand, eight hundred sixty-five".