78120667 has 2 divisors, whose sum is σ = 78120668. Its totient is φ = 78120666.

The previous prime is 78120631. The next prime is 78120677. The reversal of 78120667 is 76602187.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 78120667 - 2¹¹ = 78118619 is a prime.

It is a super-2 number, since 2×78120667² = 12205677225049778, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (78120677) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 39060333 + 39060334.

It is an arithmetic number, because the mean of its divisors is an integer number (39060334).

Almost surely, 2^78120667 is an apocalyptic number.

78120667 is a deficient number, since it is larger than the sum of its proper divisors (1).

78120667 is an equidigital number, since it uses as much as digits as its factorization.

78120667 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 28224, while the sum is 37.

The square root of 78120667 is about 8838.5896499385. The cubic root of 78120667 is about 427.4860832422.

It can be divided in two parts, 78120 and 667, that added together give a palindrome (78787).

The spelling of 78120667 in words is "seventy-eight million, one hundred twenty thousand, six hundred sixty-seven".