78619723021 has 32 divisors (see below), whose sum is σ = 99014952960. Its totient is φ = 60866220096.

The previous prime is 78619722977. The next prime is 78619723033. The reversal of 78619723021 is 12032791687.

It is a cyclic number.

It is not a de Polignac number, because 78619723021 - 2⁷ = 78619722893 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (78619723121) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 897255 + ... + 980971.

It is an arithmetic number, because the mean of its divisors is an integer number (3094217280).

Almost surely, 2^78619723021 is an apocalyptic number.

It is an amenable number.

78619723021 is a deficient number, since it is larger than the sum of its proper divisors (20395229939).

78619723021 is a wasteful number, since it uses less digits than its factorization.

78619723021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 84073.

The product of its (nonzero) digits is 254016, while the sum is 46.

The spelling of 78619723021 in words is "seventy-eight billion, six hundred nineteen million, seven hundred twenty-three thousand, twenty-one".