78729022 has 4 divisors (see below), whose sum is σ = 118093536. Its totient is φ = 39364510.

The previous prime is 78728999. The next prime is 78729029. The reversal of 78729022 is 22092787.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (78729029) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 19682254 + ... + 19682257.

It is an arithmetic number, because the mean of its divisors is an integer number (29523384).

Almost surely, 2^78729022 is an apocalyptic number.

78729022 is a deficient number, since it is larger than the sum of its proper divisors (39364514).

78729022 is a wasteful number, since it uses less digits than its factorization.

78729022 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 39364513.

The product of its (nonzero) digits is 28224, while the sum is 37.

The square root of 78729022 is about 8872.9376195260. The cubic root of 78729022 is about 428.5928801220.

The spelling of 78729022 in words is "seventy-eight million, seven hundred twenty-nine thousand, twenty-two".