78113641 has 2 divisors, whose sum is σ = 78113642. Its totient is φ = 78113640.

The previous prime is 78113621. The next prime is 78113687. The reversal of 78113641 is 14631187.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 57320041 + 20793600 = 7571^2 + 4560^2 .

It is a cyclic number.

It is not a de Polignac number, because 78113641 - 2¹⁹ = 77589353 is a prime.

It is a super-2 number, since 2×78113641² = 12203481820553762, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (78113621) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 39056820 + 39056821.

It is an arithmetic number, because the mean of its divisors is an integer number (39056821).

Almost surely, 2^78113641 is an apocalyptic number.

It is an amenable number.

78113641 is a deficient number, since it is larger than the sum of its proper divisors (1).

78113641 is an equidigital number, since it uses as much as digits as its factorization.

78113641 is an evil number, because the sum of its binary digits is even.

The product of its digits is 4032, while the sum is 31.

The square root of 78113641 is about 8838.1921793996. The cubic root of 78113641 is about 427.4732671404.

The spelling of 78113641 in words is "seventy-eight million, one hundred thirteen thousand, six hundred forty-one".