74407721 has 8 divisors (see below), whose sum is σ = 77128320. Its totient is φ = 71734608.

The previous prime is 74407717. The next prime is 74407727. The reversal of 74407721 is 12770447.

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 74407721 - 2² = 74407717 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (74407727) 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, 8666 + ... + 14963.

It is an arithmetic number, because the mean of its divisors is an integer number (9641040).

Almost surely, 2^74407721 is an apocalyptic number.

It is an amenable number.

74407721 is a deficient number, since it is larger than the sum of its proper divisors (2720599).

74407721 is a wasteful number, since it uses less digits than its factorization.

74407721 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 23743.

The product of its (nonzero) digits is 10976, while the sum is 32.

The square root of 74407721 is about 8625.9910155298. The cubic root of 74407721 is about 420.6032921185.

The spelling of 74407721 in words is "seventy-four million, four hundred seven thousand, seven hundred twenty-one".