815302772 has 6 divisors (see below), whose sum is σ = 1426779858. Its totient is φ = 407651384.

The previous prime is 815302757. The next prime is 815302811. The reversal of 815302772 is 277203518.

It can be written as a sum of positive squares in only one way, i.e., 742780516 + 72522256 = 27254^2 + 8516^2 .

It is a super-2 number, since 2×815302772² = 1329437220061767968, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 101912843 + ... + 101912850.

It is an arithmetic number, because the mean of its divisors is an integer number (237796643).

Almost surely, 2^815302772 is an apocalyptic number.

It is an amenable number.

815302772 is a deficient number, since it is larger than the sum of its proper divisors (611477086).

815302772 is a wasteful number, since it uses less digits than its factorization.

815302772 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 203825697 (or 203825695 counting only the distinct ones).

The product of its (nonzero) digits is 23520, while the sum is 35.

The square root of 815302772 is about 28553.5071751265. The cubic root of 815302772 is about 934.1995196341.

The spelling of 815302772 in words is "eight hundred fifteen million, three hundred two thousand, seven hundred seventy-two".