78204631 has 2 divisors, whose sum is σ = 78204632. Its totient is φ = 78204630.

The previous prime is 78204617. The next prime is 78204653. The reversal of 78204631 is 13640287.

It is a weak prime.

It is an emirp because it is prime and its reverse (13640287) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-78204631 is a prime.

It is a super-2 number, since 2×78204631² = 12231928619692322, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 78204593 and 78204602.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (78204691) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 39102315 + 39102316.

It is an arithmetic number, because the mean of its divisors is an integer number (39102316).

Almost surely, 2^78204631 is an apocalyptic number.

78204631 is a deficient number, since it is larger than the sum of its proper divisors (1).

78204631 is an equidigital number, since it uses as much as digits as its factorization.

78204631 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 8064, while the sum is 31.

The square root of 78204631 is about 8843.3382271629. The cubic root of 78204631 is about 427.6391822498.

The spelling of 78204631 in words is "seventy-eight million, two hundred four thousand, six hundred thirty-one".