78026781 has 8 divisors (see below), whose sum is σ = 118897984. Its totient is φ = 44586720.

The previous prime is 78026761. The next prime is 78026789. The reversal of 78026781 is 18762087.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 78026781 - 2⁶ = 78026717 is a prime.

It is a super-2 number, since 2×78026781² = 12176357106443922, which contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (78026789) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1857760 + ... + 1857801.

It is an arithmetic number, because the mean of its divisors is an integer number (14862248).

Almost surely, 2^78026781 is an apocalyptic number.

It is an amenable number.

78026781 is a deficient number, since it is larger than the sum of its proper divisors (40871203).

78026781 is a wasteful number, since it uses less digits than its factorization.

78026781 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3715571.

The product of its (nonzero) digits is 37632, while the sum is 39.

The square root of 78026781 is about 8833.2769117695. The cubic root of 78026781 is about 427.3147626051.

The spelling of 78026781 in words is "seventy-eight million, twenty-six thousand, seven hundred eighty-one".