815980045 has 8 divisors (see below), whose sum is σ = 982306296. Its totient is φ = 650697216.

The previous prime is 815980031. The next prime is 815980051. The reversal of 815980045 is 540089518.

It can be written as a sum of positive squares in 4 ways, for example, as 48191364 + 767788681 = 6942^2 + 27709^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 815980045 - 2⁵ = 815980013 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 259132 + ... + 262261.

It is an arithmetic number, because the mean of its divisors is an integer number (122788287).

Almost surely, 2^815980045 is an apocalyptic number.

It is an amenable number.

815980045 is a deficient number, since it is larger than the sum of its proper divisors (166326251).

815980045 is a wasteful number, since it uses less digits than its factorization.

815980045 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 521711.

The product of its (nonzero) digits is 57600, while the sum is 40.

The square root of 815980045 is about 28565.3644296725. The cubic root of 815980045 is about 934.4581282626.

The spelling of 815980045 in words is "eight hundred fifteen million, nine hundred eighty thousand, forty-five".