628915381 has 8 divisors (see below), whose sum is σ = 673997184. Its totient is φ = 585311760.

The previous prime is 628915379. The next prime is 628915387. The reversal of 628915381 is 183519826.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 628915381 - 2¹ = 628915379 is a prime.

It is a super-2 number, since 2×628915381² = 791069112916750322, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (628915387) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 368665 + ... + 370366.

It is an arithmetic number, because the mean of its divisors is an integer number (84249648).

Almost surely, 2^628915381 is an apocalyptic number.

It is an amenable number.

628915381 is a deficient number, since it is larger than the sum of its proper divisors (45081803).

628915381 is a wasteful number, since it uses less digits than its factorization.

628915381 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 739091.

The product of its digits is 103680, while the sum is 43.

The square root of 628915381 is about 25078.1853609865. The cubic root of 628915381 is about 856.7696466276.

The spelling of 628915381 in words is "six hundred twenty-eight million, nine hundred fifteen thousand, three hundred eighty-one".