742647731 has 16 divisors (see below), whose sum is σ = 858594816. Its totient is φ = 629192256.

The previous prime is 742647727. The next prime is 742647767. The reversal of 742647731 is 137746247.

It is not a de Polignac number, because 742647731 - 2² = 742647727 is a prime.

It is a super-2 number, since 2×742647731² = 1103051304718896722, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (742647721) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 461330 + ... + 462936.

It is an arithmetic number, because the mean of its divisors is an integer number (53662176).

Almost surely, 2^742647731 is an apocalyptic number.

742647731 is a deficient number, since it is larger than the sum of its proper divisors (115947085).

742647731 is a wasteful number, since it uses less digits than its factorization.

742647731 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2338.

The product of its digits is 197568, while the sum is 41.

The square root of 742647731 is about 27251.5638266871. The cubic root of 742647731 is about 905.5816620312.

The spelling of 742647731 in words is "seven hundred forty-two million, six hundred forty-seven thousand, seven hundred thirty-one".