38628791 has 2 divisors, whose sum is σ = 38628792. Its totient is φ = 38628790.

The previous prime is 38628787. The next prime is 38628809. The reversal of 38628791 is 19782683.

It is a weak prime.

It is an emirp because it is prime and its reverse (19782683) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 38628791 - 2² = 38628787 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (38628761) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 19314395 + 19314396.

It is an arithmetic number, because the mean of its divisors is an integer number (19314396).

Almost surely, 2^38628791 is an apocalyptic number.

38628791 is a deficient number, since it is larger than the sum of its proper divisors (1).

38628791 is an equidigital number, since it uses as much as digits as its factorization.

38628791 is an evil number, because the sum of its binary digits is even.

The product of its digits is 145152, while the sum is 44.

The square root of 38628791 is about 6215.2064326135. The cubic root of 38628791 is about 338.0417738362.

The spelling of 38628791 in words is "thirty-eight million, six hundred twenty-eight thousand, seven hundred ninety-one".