78000631 has 4 divisors (see below), whose sum is σ = 78204672. Its totient is φ = 77796592.

The previous prime is 78000617. The next prime is 78000647. The reversal of 78000631 is 13600087.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 13600087 = 79 ⋅172153.

It is a cyclic number.

It is not a de Polignac number, because 78000631 - 2⁵ = 78000599 is a prime.

It is a super-2 number, since 2×78000631² = 12168196872796322, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 78000596 and 78000605.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (78000031) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 101446 + ... + 102211.

It is an arithmetic number, because the mean of its divisors is an integer number (19551168).

Almost surely, 2^78000631 is an apocalyptic number.

78000631 is a deficient number, since it is larger than the sum of its proper divisors (204041).

78000631 is a wasteful number, since it uses less digits than its factorization.

78000631 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 204040.

The product of its (nonzero) digits is 1008, while the sum is 25.

The square root of 78000631 is about 8831.7965895960. The cubic root of 78000631 is about 427.2670203238.

The spelling of 78000631 in words is "seventy-eight million, six hundred thirty-one", and thus it is an aban number.