29798640 has 60 divisors (see below), whose sum is σ = 100076184. Its totient is φ = 7946112.

The previous prime is 29798633. The next prime is 29798641. The reversal of 29798640 is 4689792.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (60).

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (29798641) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 19974 + ... + 21413.

Almost surely, 2^29798640 is an apocalyptic number.

29798640 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

29798640 is an abundant number, since it is smaller than the sum of its proper divisors (70277544).

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

29798640 is a wasteful number, since it uses less digits than its factorization.

29798640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 41406 (or 41397 counting only the distinct ones).

The product of its (nonzero) digits is 217728, while the sum is 45.

The square root of 29798640 is about 5458.8130577993. The cubic root of 29798640 is about 310.0264979084.

The spelling of 29798640 in words is "twenty-nine million, seven hundred ninety-eight thousand, six hundred forty".