29906528781 has 8 divisors (see below), whose sum is σ = 40723784064. Its totient is φ = 19513479680.

The previous prime is 29906528779. The next prime is 29906528791. The reversal of 29906528781 is 18782560992.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 29906528781 - 2¹ = 29906528779 is a prime.

It is a super-2 number, since 2×29906528781² (a number of 22 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (29906528791) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 106051380 + ... + 106051661.

It is an arithmetic number, because the mean of its divisors is an integer number (5090473008).

Almost surely, 2^29906528781 is an apocalyptic number.

It is an amenable number.

29906528781 is a deficient number, since it is larger than the sum of its proper divisors (10817255283).

29906528781 is a wasteful number, since it uses less digits than its factorization.

29906528781 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 212103091.

The product of its (nonzero) digits is 4354560, while the sum is 57.

The spelling of 29906528781 in words is "twenty-nine billion, nine hundred six million, five hundred twenty-eight thousand, seven hundred eighty-one".