29128340 has 12 divisors (see below), whose sum is σ = 61169556. Its totient is φ = 11651328.

The previous prime is 29128321. The next prime is 29128369. The reversal of 29128340 is 4382192.

It can be written as a sum of positive squares in 2 ways, for example, as 17322244 + 11806096 = 4162^2 + 3436^2 .

It is a super-3 number, since 3×29128340³ (a number of 23 digits) contains 333 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 728189 + ... + 728228.

It is an arithmetic number, because the mean of its divisors is an integer number (5097463).

Almost surely, 2^29128340 is an apocalyptic number.

29128340 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

29128340 is an abundant number, since it is smaller than the sum of its proper divisors (32041216).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

29128340 is a wasteful number, since it uses less digits than its factorization.

29128340 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1456426 (or 1456424 counting only the distinct ones).

The product of its (nonzero) digits is 3456, while the sum is 29.

The square root of 29128340 is about 5397.0677223841. The cubic root of 29128340 is about 307.6842353331.

The spelling of 29128340 in words is "twenty-nine million, one hundred twenty-eight thousand, three hundred forty".