78161306 has 4 divisors (see below), whose sum is σ = 117241962. Its totient is φ = 39080652.

The previous prime is 78161299. The next prime is 78161311. The reversal of 78161306 is 60316187.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 53071225 + 25090081 = 7285^2 + 5009^2 .

It is a super-2 number, since 2×78161306² = 12218379511251272, which contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 19540325 + ... + 19540328.

Almost surely, 2^78161306 is an apocalyptic number.

78161306 is a deficient number, since it is larger than the sum of its proper divisors (39080656).

78161306 is a wasteful number, since it uses less digits than its factorization.

78161306 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 39080655.

The product of its (nonzero) digits is 6048, while the sum is 32.

The square root of 78161306 is about 8840.8883037849. Note that the first 3 decimals coincide. The cubic root of 78161306 is about 427.5601976263.

The spelling of 78161306 in words is "seventy-eight million, one hundred sixty-one thousand, three hundred six".