29439147840 has 56 divisors (see below), whose sum is σ = 93469297440. Its totient is φ = 7850439168.

The previous prime is 29439147833. The next prime is 29439147851. The reversal of 29439147840 is 4874193492.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 15331930 + ... + 15333849.

Almost surely, 2^29439147840 is an apocalyptic number.

29439147840 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

29439147840 is an abundant number, since it is smaller than the sum of its proper divisors (64030149600).

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

29439147840 is a wasteful number, since it uses less digits than its factorization.

29439147840 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 30665799 (or 30665789 counting only the distinct ones).

The product of its (nonzero) digits is 1741824, while the sum is 51.

The spelling of 29439147840 in words is "twenty-nine billion, four hundred thirty-nine million, one hundred forty-seven thousand, eight hundred forty".