78622940905987 has 4 divisors (see below), whose sum is σ = 78623248245696. Its totient is φ = 78622633566280.

The previous prime is 78622940905967. The next prime is 78622940906009. The reversal of 78622940905987 is 78950904922687.

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 78622940905987 - 2³⁵ = 78588581167619 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (78622940905937) 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, 153285808 + ... + 153797869.

It is an arithmetic number, because the mean of its divisors is an integer number (19655812061424).

Almost surely, 2^{78622940905987} is an apocalyptic number.

78622940905987 is a deficient number, since it is larger than the sum of its proper divisors (307339709).

78622940905987 is a wasteful number, since it uses less digits than its factorization.

78622940905987 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 307339708.

The product of its (nonzero) digits is 1097349120, while the sum is 76.

The spelling of 78622940905987 in words is "seventy-eight trillion, six hundred twenty-two billion, nine hundred forty million, nine hundred five thousand, nine hundred eighty-seven".