29897981620 has 192 divisors, whose sum is σ = 74235893760. Its totient is φ = 10015488000.

The previous prime is 29897981593. The next prime is 29897981621. The reversal of 29897981620 is 2618979892.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (29897981621) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 15466174 + ... + 15468106.

It is an arithmetic number, because the mean of its divisors is an integer number (386645280).

Almost surely, 2^29897981620 is an apocalyptic number.

29897981620 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 29897981620, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (37117946880).

29897981620 is an abundant number, since it is smaller than the sum of its proper divisors (44337912140).

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

29897981620 is a wasteful number, since it uses less digits than its factorization.

29897981620 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2106 (or 2104 counting only the distinct ones).

The product of its (nonzero) digits is 7838208, while the sum is 61.

The spelling of 29897981620 in words is "twenty-nine billion, eight hundred ninety-seven million, nine hundred eighty-one thousand, six hundred twenty".