735866721 has 8 divisors (see below), whose sum is σ = 1090172960. Its totient is φ = 490577796.

The previous prime is 735866699. The next prime is 735866723. The reversal of 735866721 is 127668537.

735866721 is a `hidden beast` number, since 7 + 3 + 586 + 67 + 2 + 1 = 666.

It is not a de Polignac number, because 735866721 - 2⁵ = 735866689 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (735866723) 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, 13627135 + ... + 13627188.

It is an arithmetic number, because the mean of its divisors is an integer number (136271620).

Almost surely, 2^735866721 is an apocalyptic number.

It is an amenable number.

735866721 is a deficient number, since it is larger than the sum of its proper divisors (354306239).

735866721 is a wasteful number, since it uses less digits than its factorization.

735866721 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 27254332 (or 27254326 counting only the distinct ones).

The product of its digits is 423360, while the sum is 45.

The square root of 735866721 is about 27126.8634567286. The cubic root of 735866721 is about 902.8169847971.

The spelling of 735866721 in words is "seven hundred thirty-five million, eight hundred sixty-six thousand, seven hundred twenty-one".