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72390025 = 524496449
BaseRepresentation
bin1000101000010…
…01010110001001
312001012210110001
410110021112021
5122012440100
611103323001
71536206431
oct424112611
9161183401
1072390025
1137953774
12202b0461
1311cc7646
1498852c1
15654dd6a
hex4509589

72390025 has 12 divisors (see below), whose sum is σ = 89977500. Its totient is φ = 57774080.

The previous prime is 72390007. The next prime is 72390041. The reversal of 72390025 is 52009327.

It can be written as a sum of positive squares in 6 ways, for example, as 3433609 + 68956416 = 1853^2 + 8304^2 .

It is not a de Polignac number, because 72390025 - 27 = 72389897 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 72389975 and 72390002.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 8001 + ... + 14449.

It is an arithmetic number, because the mean of its divisors is an integer number (7498125).

Almost surely, 272390025 is an apocalyptic number.

It is an amenable number.

72390025 is a deficient number, since it is larger than the sum of its proper divisors (17587475).

72390025 is a wasteful number, since it uses less digits than its factorization.

72390025 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6908 (or 6903 counting only the distinct ones).

The product of its (nonzero) digits is 3780, while the sum is 28.

The square root of 72390025 is about 8508.2327777277. The cubic root of 72390025 is about 416.7666018070.

The spelling of 72390025 in words is "seventy-two million, three hundred ninety thousand, twenty-five".

Divisors: 1 5 25 449 2245 6449 11225 32245 161225 2895601 14478005 72390025