742991805 has 32 divisors (see below), whose sum is σ = 1322133120. Its totient is φ = 395884800.

The previous prime is 742991771. The next prime is 742991807. The reversal of 742991805 is 508199247.

It is not a de Polignac number, because 742991805 - 2⁷ = 742991677 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (742991807) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 193989 + ... + 197781.

It is an arithmetic number, because the mean of its divisors is an integer number (41316660).

Almost surely, 2^742991805 is an apocalyptic number.

It is an amenable number.

742991805 is a deficient number, since it is larger than the sum of its proper divisors (579141315).

742991805 is a wasteful number, since it uses less digits than its factorization.

742991805 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5258 (or 5252 counting only the distinct ones).

The product of its (nonzero) digits is 181440, while the sum is 45.

The square root of 742991805 is about 27257.8760177678. The cubic root of 742991805 is about 905.7214945897.

The spelling of 742991805 in words is "seven hundred forty-two million, nine hundred ninety-one thousand, eight hundred five".