80198945 has 12 divisors (see below), whose sum is σ = 102234684. Its totient is φ = 60384000.

The previous prime is 80198941. The next prime is 80198947. The reversal of 80198945 is 54989108.

It can be written as a sum of positive squares in 6 ways, for example, as 12103441 + 68095504 = 3479^2 + 8252^2 .

It is not a de Polignac number, because 80198945 - 2² = 80198941 is a prime.

It is a super-2 number, since 2×80198945² = 12863741558226050, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 80198896 and 80198905.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (80198941) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 26306 + ... + 29195.

It is an arithmetic number, because the mean of its divisors is an integer number (8519557).

Almost surely, 2^80198945 is an apocalyptic number.

80198945 is a gapful number since it is divisible by the number (85) formed by its first and last digit.

It is an amenable number.

80198945 is a deficient number, since it is larger than the sum of its proper divisors (22035739).

80198945 is a wasteful number, since it uses less digits than its factorization.

80198945 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 55540 (or 55523 counting only the distinct ones).

The product of its (nonzero) digits is 103680, while the sum is 44.

The square root of 80198945 is about 8955.3863679911. The cubic root of 80198945 is about 431.2438206774.

The spelling of 80198945 in words is "eighty million, one hundred ninety-eight thousand, nine hundred forty-five".