78022731 has 16 divisors (see below), whose sum is σ = 109654560. Its totient is φ = 49271040.

The previous prime is 78022729. The next prime is 78022781. The reversal of 78022731 is 13722087.

It is not a de Polignac number, because 78022731 - 2¹ = 78022729 is a prime.

It is a super-3 number, since 3×78022731³ (a number of 25 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is not an unprimeable number, because it can be changed into a prime (78022781) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 3850 + ... + 13071.

It is an arithmetic number, because the mean of its divisors is an integer number (6853410).

Almost surely, 2^78022731 is an apocalyptic number.

78022731 is a deficient number, since it is larger than the sum of its proper divisors (31631829).

78022731 is a wasteful number, since it uses less digits than its factorization.

78022731 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17006.

The product of its (nonzero) digits is 4704, while the sum is 30.

The square root of 78022731 is about 8833.0476620473. The cubic root of 78022731 is about 427.3073691833.

The spelling of 78022731 in words is "seventy-eight million, twenty-two thousand, seven hundred thirty-one".