80742505 has 12 divisors (see below), whose sum is σ = 97740036. Its totient is φ = 64032800.

The previous prime is 80742499. The next prime is 80742511. The reversal of 80742505 is 50524708.

It is an interprime number because it is at equal distance from previous prime (80742499) and next prime (80742511).

It can be written as a sum of positive squares in 2 ways, for example, as 39538944 + 41203561 = 6288^2 + 6419^2 .

It is a de Polignac number, because none of the positive numbers 2^k-80742505 is a prime.

It is a super-2 number, since 2×80742505² = 13038704227350050, which contains 22 as substring.

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 11 ways as a sum of consecutive naturals, for example, 85335 + ... + 86275.

It is an arithmetic number, because the mean of its divisors is an integer number (8145003).

Almost surely, 2^80742505 is an apocalyptic number.

It is an amenable number.

80742505 is a deficient number, since it is larger than the sum of its proper divisors (16997531).

80742505 is an equidigital number, since it uses as much as digits as its factorization.

80742505 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1208 (or 1077 counting only the distinct ones).

The product of its (nonzero) digits is 11200, while the sum is 31.

The square root of 80742505 is about 8985.6833351727. The cubic root of 80742505 is about 432.2159003835.

The spelling of 80742505 in words is "eighty million, seven hundred forty-two thousand, five hundred five".