71407721 has 8 divisors (see below), whose sum is σ = 89027904. Its totient is φ = 55642320.

The previous prime is 71407717. The next prime is 71407727. The reversal of 71407721 is 12770417.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 71407721 - 2² = 71407717 is a prime.

It is not an unprimeable number, because it can be changed into a prime (71407727) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 463610 + ... + 463763.

It is an arithmetic number, because the mean of its divisors is an integer number (11128488).

Almost surely, 2^71407721 is an apocalyptic number.

It is an amenable number.

71407721 is a deficient number, since it is larger than the sum of its proper divisors (17620183).

71407721 is a wasteful number, since it uses less digits than its factorization.

71407721 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 927391.

The product of its (nonzero) digits is 2744, while the sum is 29.

The square root of 71407721 is about 8450.3089292641. The cubic root of 71407721 is about 414.8728908635.

The spelling of 71407721 in words is "seventy-one million, four hundred seven thousand, seven hundred twenty-one".