152890721 has 8 divisors (see below), whose sum is σ = 154849800. Its totient is φ = 150939648.

The previous prime is 152890709. The next prime is 152890733. The reversal of 152890721 is 127098251.

152890721 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is an interprime number because it is at equal distance from previous prime (152890709) and next prime (152890733).

It can be written as a sum of positive squares in 4 ways, for example, as 6964321 + 145926400 = 2639^2 + 12080^2 .

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-152890721 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (152890421) 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, 42605 + ... + 46053.

It is an arithmetic number, because the mean of its divisors is an integer number (19356225).

Almost surely, 2^152890721 is an apocalyptic number.

It is an amenable number.

152890721 is a deficient number, since it is larger than the sum of its proper divisors (1959079).

152890721 is an equidigital number, since it uses as much as digits as its factorization.

152890721 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4003.

The product of its (nonzero) digits is 10080, while the sum is 35.

The square root of 152890721 is about 12364.8987460472. The cubic root of 152890721 is about 534.7207568278.

The spelling of 152890721 in words is "one hundred fifty-two million, eight hundred ninety thousand, seven hundred twenty-one".