152628391 has 4 divisors (see below), whose sum is σ = 159264432. Its totient is φ = 145992352.

The previous prime is 152628389. The next prime is 152628461. The reversal of 152628391 is 193826251.

152628391 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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

It is a cyclic number.

It is not a de Polignac number, because 152628391 - 2¹ = 152628389 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 152628391.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (152628361) 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, 3317986 + ... + 3318031.

It is an arithmetic number, because the mean of its divisors is an integer number (39816108).

Almost surely, 2^152628391 is an apocalyptic number.

152628391 is a deficient number, since it is larger than the sum of its proper divisors (6636041).

152628391 is an equidigital number, since it uses as much as digits as its factorization.

152628391 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6636040.

The product of its digits is 25920, while the sum is 37.

The square root of 152628391 is about 12354.2863411854. The cubic root of 152628391 is about 534.4147570069.

It can be divided in two parts, 15262 and 8391, that added together give a triangular number (23653 = T₂₁₇).

The spelling of 152628391 in words is "one hundred fifty-two million, six hundred twenty-eight thousand, three hundred ninety-one".