747787649 has 16 divisors (see below), whose sum is σ = 907987200. Its totient is φ = 602126784.

The previous prime is 747787631. The next prime is 747787657. The reversal of 747787649 is 946787747.

It is a happy number.

It is not a de Polignac number, because 747787649 - 2²⁰ = 746739073 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (747787609) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 42269 + ... + 57290.

It is an arithmetic number, because the mean of its divisors is an integer number (56749200).

Almost surely, 2^747787649 is an apocalyptic number.

It is an amenable number.

747787649 is a deficient number, since it is larger than the sum of its proper divisors (160199551).

747787649 is a wasteful number, since it uses less digits than its factorization.

747787649 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 99632.

The product of its digits is 16595712, while the sum is 59.

The square root of 747787649 is about 27345.7062260239. The cubic root of 747787649 is about 907.6660591068. Note that the first 3 decimals are identical.

The spelling of 747787649 in words is "seven hundred forty-seven million, seven hundred eighty-seven thousand, six hundred forty-nine".