29975640 has 32 divisors (see below), whose sum is σ = 89927280. Its totient is φ = 7993472.

The previous prime is 29975639. The next prime is 29975653. The reversal of 29975640 is 4657992.

It is a junction number, because it is equal to n+sod(n) for n = 29975592 and 29975601.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 124779 + ... + 125018.

Almost surely, 2^29975640 is an apocalyptic number.

29975640 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

29975640 is an abundant number, since it is smaller than the sum of its proper divisors (59951640).

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

29975640 is a wasteful number, since it uses less digits than its factorization.

29975640 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 249811 (or 249807 counting only the distinct ones).

The product of its (nonzero) digits is 136080, while the sum is 42.

The square root of 29975640 is about 5475.0013698628. The cubic root of 29975640 is about 310.6391253949.

The spelling of 29975640 in words is "twenty-nine million, nine hundred seventy-five thousand, six hundred forty".