129249028 has 12 divisors (see below), whose sum is σ = 239490972. Its totient is φ = 60823040.

The previous prime is 129249019. The next prime is 129249037. The reversal of 129249028 is 820942921.

It is an interprime number because it is at equal distance from previous prime (129249019) and next prime (129249037).

It can be written as a sum of positive squares in 2 ways, for example, as 109160704 + 20088324 = 10448^2 + 4482^2 .

It is a super-2 number, since 2×129249028² = 33410622477889568, which contains 22 as substring.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 950293 + ... + 950428.

It is an arithmetic number, because the mean of its divisors is an integer number (19957581).

Almost surely, 2^129249028 is an apocalyptic number.

It is an amenable number.

129249028 is a deficient number, since it is larger than the sum of its proper divisors (110241944).

129249028 is a wasteful number, since it uses less digits than its factorization.

129249028 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1900742 (or 1900740 counting only the distinct ones).

The product of its (nonzero) digits is 20736, while the sum is 37.

The square root of 129249028 is about 11368.7742523106. The cubic root of 129249028 is about 505.6023632671.

It can be divided in two parts, 12924 and 9028, that added together give a cube (21952 = 28³).

The spelling of 129249028 in words is "one hundred twenty-nine million, two hundred forty-nine thousand, twenty-eight".