997728029 has 2 divisors, whose sum is σ = 997728030. Its totient is φ = 997728028.

The previous prime is 997728023. The next prime is 997728041. The reversal of 997728029 is 920827799.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 735223225 + 262504804 = 27115^2 + 16202^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-997728029 is a prime.

It is a super-2 number, since 2×997728029² = 1990922439704449682, which contains 22 as substring.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (997728023) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 498864014 + 498864015.

It is an arithmetic number, because the mean of its divisors is an integer number (498864015).

Almost surely, 2^997728029 is an apocalyptic number.

It is an amenable number.

997728029 is a deficient number, since it is larger than the sum of its proper divisors (1).

997728029 is an equidigital number, since it uses as much as digits as its factorization.

997728029 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1143072, while the sum is 53.

The square root of 997728029 is about 31586.8331587704. The cubic root of 997728029 is about 999.2421020692.

The spelling of 997728029 in words is "nine hundred ninety-seven million, seven hundred twenty-eight thousand, twenty-nine".