71257401 has 10 divisors (see below), whose sum is σ = 106446362. Its totient is φ = 47504880.

The previous prime is 71257393. The next prime is 71257441. The reversal of 71257401 is 10475217.

71257401 is a `hidden beast` number, since 7 + 1 + 257 + 401 = 666.

It can be written as a sum of positive squares in only one way, i.e., 60466176 + 10791225 = 7776^2 + 3285^2 .

It is not a de Polignac number, because 71257401 - 2³ = 71257393 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (71257441) by changing a digit.

It is a polite number, since it can be written in 9 ways as a sum of consecutive naturals, for example, 439780 + ... + 439941.

Almost surely, 2^71257401 is an apocalyptic number.

It is an amenable number.

71257401 is a deficient number, since it is larger than the sum of its proper divisors (35188961).

71257401 is an equidigital number, since it uses as much as digits as its factorization.

71257401 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 879733 (or 879724 counting only the distinct ones).

The product of its (nonzero) digits is 1960, while the sum is 27.

The square root of 71257401 is about 8441.4098940876. The cubic root of 71257401 is about 414.5815708036.

The spelling of 71257401 in words is "seventy-one million, two hundred fifty-seven thousand, four hundred one".