742206505 has 4 divisors (see below), whose sum is σ = 890647812. Its totient is φ = 593765200.

The previous prime is 742206499. The next prime is 742206539. The reversal of 742206505 is 505602247.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 505602247 = 12527 ⋅40361.

It can be written as a sum of positive squares in 2 ways, for example, as 122146704 + 620059801 = 11052^2 + 24901^2 .

It is not a de Polignac number, because 742206505 - 2¹⁵ = 742173737 is a prime.

It is a Smith number, since the sum of its digits (31) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 74220646 + ... + 74220655.

It is an arithmetic number, because the mean of its divisors is an integer number (222661953).

Almost surely, 2^742206505 is an apocalyptic number.

It is an amenable number.

742206505 is a deficient number, since it is larger than the sum of its proper divisors (148441307).

742206505 is a wasteful number, since it uses less digits than its factorization.

742206505 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 148441306.

The product of its (nonzero) digits is 16800, while the sum is 31.

The square root of 742206505 is about 27243.4671985781. The cubic root of 742206505 is about 905.4022834310.

The spelling of 742206505 in words is "seven hundred forty-two million, two hundred six thousand, five hundred five".