29220619428 has 720 divisors, whose sum is σ = 106609301568. Its totient is φ = 6858432000.

The previous prime is 29220619391. The next prime is 29220619433. The reversal of 29220619428 is 82491602292.

29220619428 is a `hidden beast` number, since 2 + 9 + 2 + 2 + 0 + 619 + 4 + 28 = 666.

It is a super-2 number, since 2×29220619428² (a number of 22 digits) contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 239 ways as a sum of consecutive naturals, for example, 138486243 + ... + 138486453.

Almost surely, 2^29220619428 is an apocalyptic number.

29220619428 is a gapful number since it is divisible by the number (28) 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 29220619428, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (53304650784).

29220619428 is an abundant number, since it is smaller than the sum of its proper divisors (77388682140).

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

29220619428 is a wasteful number, since it uses less digits than its factorization.

29220619428 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 326 (or 308 counting only the distinct ones).

The product of its (nonzero) digits is 248832, while the sum is 45.

The spelling of 29220619428 in words is "twenty-nine billion, two hundred twenty million, six hundred nineteen thousand, four hundred twenty-eight".