29112517980 has 324 divisors, whose sum is σ = 111241107432. Its totient is φ = 6142106880.

The previous prime is 29112517961. The next prime is 29112518033. The reversal of 29112517980 is 8971521192.

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

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 107 ways as a sum of consecutive naturals, for example, 1480815 + ... + 1500345.

Almost surely, 2^29112517980 is an apocalyptic number.

29112517980 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 29112517980, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (55620553716).

29112517980 is an abundant number, since it is smaller than the sum of its proper divisors (82128589452).

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

29112517980 is a wasteful number, since it uses less digits than its factorization.

29112517980 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19586 (or 19561 counting only the distinct ones).

The product of its (nonzero) digits is 90720, while the sum is 45.

The spelling of 29112517980 in words is "twenty-nine billion, one hundred twelve million, five hundred seventeen thousand, nine hundred eighty".