78077641 has 2 divisors, whose sum is σ = 78077642. Its totient is φ = 78077640.

The previous prime is 78077633. The next prime is 78077683. The reversal of 78077641 is 14677087.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 56025225 + 22052416 = 7485^2 + 4696^2 .

It is a cyclic number.

It is not a de Polignac number, because 78077641 - 2³ = 78077633 is a prime.

It is a super-2 number, since 2×78077641² = 12192236048249762, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 78077594 and 78077603.

It is not a weakly prime, because it can be changed into another prime (78077941) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 39038820 + 39038821.

It is an arithmetic number, because the mean of its divisors is an integer number (39038821).

Almost surely, 2^78077641 is an apocalyptic number.

It is an amenable number.

78077641 is a deficient number, since it is larger than the sum of its proper divisors (1).

78077641 is an equidigital number, since it uses as much as digits as its factorization.

78077641 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 65856, while the sum is 40.

The square root of 78077641 is about 8836.1553291010. The cubic root of 78077641 is about 427.4075876077.

The spelling of 78077641 in words is "seventy-eight million, seventy-seven thousand, six hundred forty-one".