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78277225 = 5213240853
BaseRepresentation
bin1001010101001…
…10101001101001
312110021220011111
410222212221221
5130014332400
611433430321
71640226325
oct452465151
9173256144
1078277225
1140204924
122226b3a1
13132a91b0
14a578985
156d133ba
hex4aa6a69

78277225 has 12 divisors (see below), whose sum is σ = 104530636. Its totient is φ = 57804480.

The previous prime is 78277223. The next prime is 78277249. The reversal of 78277225 is 52277287.

It can be written as a sum of positive squares in 6 ways, for example, as 27625536 + 50651689 = 5256^2 + 7117^2 .

It is not a de Polignac number, because 78277225 - 21 = 78277223 is a prime.

It is a super-2 number, since 2×782772252 = 12254647907401250, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (78277223) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 120102 + ... + 120751.

Almost surely, 278277225 is an apocalyptic number.

It is an amenable number.

78277225 is a deficient number, since it is larger than the sum of its proper divisors (26253411).

78277225 is a wasteful number, since it uses less digits than its factorization.

78277225 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 240876 (or 240871 counting only the distinct ones).

The product of its digits is 109760, while the sum is 40.

The square root of 78277225 is about 8847.4417206331. The cubic root of 78277225 is about 427.7714610238.

The spelling of 78277225 in words is "seventy-eight million, two hundred seventy-seven thousand, two hundred twenty-five".

Divisors: 1 5 13 25 65 325 240853 1204265 3131089 6021325 15655445 78277225