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28626421992 = 23371743257907
BaseRepresentation
bin11010101010010001…
…001000100011101000
32201220000122220120120
4122222101020203220
5432111331000432
621052323323240
72032250400150
oct325221104350
981800586516
1028626421992
111115a9615a3
12566ab20520
132912937b4c
141557c53760
15b28252c2c
hex6aa4488e8

28626421992 has 256 divisors, whose sum is σ = 89057802240. Its totient is φ = 7481327616.

The previous prime is 28626421973. The next prime is 28626422017. The reversal of 28626421992 is 29912462682.

It is a happy number.

It is a super-2 number, since 2×286264219922 (a number of 22 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (51).

It is an unprimeable number.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 31561203 + ... + 31562109.

It is an arithmetic number, because the mean of its divisors is an integer number (347882040).

Almost surely, 228626421992 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 28626421992, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (44528901120).

28626421992 is an abundant number, since it is smaller than the sum of its proper divisors (60431380248).

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

28626421992 is a wasteful number, since it uses less digits than its factorization.

28626421992 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1240 (or 1236 counting only the distinct ones).

The product of its digits is 1492992, while the sum is 51.

The spelling of 28626421992 in words is "twenty-eight billion, six hundred twenty-six million, four hundred twenty-one thousand, nine hundred ninety-two".