71672305 has 16 divisors (see below), whose sum is σ = 88465104. Its totient is φ = 55710720.

The previous prime is 71672281. The next prime is 71672317. The reversal of 71672305 is 50327617.

It can be written as a sum of positive squares in 8 ways, for example, as 50253921 + 21418384 = 7089^2 + 4628^2 .

It is not a de Polignac number, because 71672305 - 2⁹ = 71671793 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 63607 + ... + 64723.

It is an arithmetic number, because the mean of its divisors is an integer number (5529069).

Almost surely, 2^71672305 is an apocalyptic number.

It is an amenable number.

71672305 is a deficient number, since it is larger than the sum of its proper divisors (16792799).

71672305 is a wasteful number, since it uses less digits than its factorization.

71672305 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1476.

The product of its (nonzero) digits is 8820, while the sum is 31.

The square root of 71672305 is about 8465.9497399878. The cubic root of 71672305 is about 415.3846629427.

The spelling of 71672305 in words is "seventy-one million, six hundred seventy-two thousand, three hundred five".