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68048665 = 513609733
BaseRepresentation
bin1000000111001…
…01011100011001
311202001020012221
410003211130121
5114410024130
610430304041
71454255416
oct403453431
9152036187
1068048665
1135458a73
121a958021
13111375a9
14907510d
155e9287a
hex40e5719

68048665 has 4 divisors (see below), whose sum is σ = 81658404. Its totient is φ = 54438928.

The previous prime is 68048663. The next prime is 68048677. The reversal of 68048665 is 56684086.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 11978521 + 56070144 = 3461^2 + 7488^2 .

It is a cyclic number.

It is not a de Polignac number, because 68048665 - 21 = 68048663 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (68048663) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6804862 + ... + 6804871.

It is an arithmetic number, because the mean of its divisors is an integer number (20414601).

Almost surely, 268048665 is an apocalyptic number.

It is an amenable number.

68048665 is a deficient number, since it is larger than the sum of its proper divisors (13609739).

68048665 is a wasteful number, since it uses less digits than its factorization.

68048665 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13609738.

The product of its (nonzero) digits is 276480, while the sum is 43.

The square root of 68048665 is about 8249.1614725377. The cubic root of 68048665 is about 408.2628564562.

The spelling of 68048665 in words is "sixty-eight million, forty-eight thousand, six hundred sixty-five".

Divisors: 1 5 13609733 68048665