71621479 has 4 divisors (see below), whose sum is σ = 72528160. Its totient is φ = 70714800.

The previous prime is 71621443. The next prime is 71621483. The reversal of 71621479 is 97412617.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 97412617 = 137 ⋅711041.

It is a cyclic number.

It is not a de Polignac number, because 71621479 - 2¹³ = 71613287 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (71621419) 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, 453222 + ... + 453379.

It is an arithmetic number, because the mean of its divisors is an integer number (18132040).

Almost surely, 2^71621479 is an apocalyptic number.

71621479 is a gapful number since it is divisible by the number (79) formed by its first and last digit.

71621479 is a deficient number, since it is larger than the sum of its proper divisors (906681).

71621479 is an equidigital number, since it uses as much as digits as its factorization.

71621479 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 906680.

The product of its digits is 21168, while the sum is 37.

The square root of 71621479 is about 8462.9474180099. The cubic root of 71621479 is about 415.2864505141.

The spelling of 71621479 in words is "seventy-one million, six hundred twenty-one thousand, four hundred seventy-nine".