78161746 has 16 divisors (see below), whose sum is σ = 126998424. Its totient is φ = 35864064.

The previous prime is 78161737. The next prime is 78161789. The reversal of 78161746 is 64716187.

It can be written as a sum of positive squares in 4 ways, for example, as 51998521 + 26163225 = 7211^2 + 5115^2 .

It is a super-2 number, since 2×78161746² = 12218517075537032, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 78161699 and 78161708.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4191 + ... + 13186.

Almost surely, 2^78161746 is an apocalyptic number.

78161746 is a deficient number, since it is larger than the sum of its proper divisors (48836678).

78161746 is a wasteful number, since it uses less digits than its factorization.

78161746 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17565.

The product of its digits is 56448, while the sum is 40.

The square root of 78161746 is about 8840.9131881271. The cubic root of 78161746 is about 427.5609999249.

The spelling of 78161746 in words is "seventy-eight million, one hundred sixty-one thousand, seven hundred forty-six".