78032731 has 4 divisors (see below), whose sum is σ = 89180272. Its totient is φ = 66885192.

The previous prime is 78032683. The next prime is 78032743. The reversal of 78032731 is 13723087.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 78032731 - 2⁹ = 78032219 is a prime.

It is a super-2 number, since 2×78032731² = 12178214214636722, 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 = 78032693 and 78032702.

It is not an unprimeable number, because it can be changed into a prime (78032131) 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, 5573760 + ... + 5573773.

It is an arithmetic number, because the mean of its divisors is an integer number (22295068).

Almost surely, 2^78032731 is an apocalyptic number.

78032731 is a deficient number, since it is larger than the sum of its proper divisors (11147541).

78032731 is a wasteful number, since it uses less digits than its factorization.

78032731 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11147540.

The product of its (nonzero) digits is 7056, while the sum is 31.

The square root of 78032731 is about 8833.6136999532. The cubic root of 78032731 is about 427.3256240819.

The spelling of 78032731 in words is "seventy-eight million, thirty-two thousand, seven hundred thirty-one".