746649721 has 4 divisors (see below), whose sum is σ = 764013712. Its totient is φ = 729285732.

The previous prime is 746649719. The next prime is 746649727. The reversal of 746649721 is 127946647.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 746649721 - 2¹ = 746649719 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (746649727) 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, 8681931 + ... + 8682016.

It is an arithmetic number, because the mean of its divisors is an integer number (191003428).

Almost surely, 2^746649721 is an apocalyptic number.

It is an amenable number.

746649721 is a deficient number, since it is larger than the sum of its proper divisors (17363991).

746649721 is a wasteful number, since it uses less digits than its factorization.

746649721 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17363990.

The product of its digits is 508032, while the sum is 46.

The square root of 746649721 is about 27324.8919668496. The cubic root of 746649721 is about 907.2054189873.

The spelling of 746649721 in words is "seven hundred forty-six million, six hundred forty-nine thousand, seven hundred twenty-one".