28961929 has 2 divisors, whose sum is σ = 28961930. Its totient is φ = 28961928.

The previous prime is 28961887. The next prime is 28961957. The reversal of 28961929 is 92916982.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 19598329 + 9363600 = 4427^2 + 3060^2 .

It is a cyclic number.

It is not a de Polignac number, because 28961929 - 2¹¹ = 28959881 is a prime.

It is not a weakly prime, because it can be changed into another prime (28961029) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14480964 + 14480965.

It is an arithmetic number, because the mean of its divisors is an integer number (14480965).

Almost surely, 2^28961929 is an apocalyptic number.

It is an amenable number.

28961929 is a deficient number, since it is larger than the sum of its proper divisors (1).

28961929 is an equidigital number, since it uses as much as digits as its factorization.

28961929 is an evil number, because the sum of its binary digits is even.

The product of its digits is 139968, while the sum is 46.

The square root of 28961929 is about 5381.6288426461. The cubic root of 28961929 is about 307.0971798153.

It can be divided in two parts, 28961 and 929, that added together give a triangular number (29890 = T₂₄₄).

The spelling of 28961929 in words is "twenty-eight million, nine hundred sixty-one thousand, nine hundred twenty-nine".