78722061 has 16 divisors (see below), whose sum is σ = 114866688. Its totient is φ = 47559600.

The previous prime is 78722047. The next prime is 78722069. The reversal of 78722061 is 16022787.

It is not a de Polignac number, because 78722061 - 2⁹ = 78721549 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (33).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (78722069) 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, 7320 + ... + 14526.

It is an arithmetic number, because the mean of its divisors is an integer number (7179168).

Almost surely, 2^78722061 is an apocalyptic number.

It is an amenable number.

78722061 is a deficient number, since it is larger than the sum of its proper divisors (36144627).

78722061 is a wasteful number, since it uses less digits than its factorization.

78722061 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7552.

The product of its (nonzero) digits is 9408, while the sum is 33.

The square root of 78722061 is about 8872.5453506871. The cubic root of 78722061 is about 428.5802480883.

The spelling of 78722061 in words is "seventy-eight million, seven hundred twenty-two thousand, sixty-one".