78622681 has 16 divisors (see below), whose sum is σ = 82368000. Its totient is φ = 74996928.

The previous prime is 78622673. The next prime is 78622693. The reversal of 78622681 is 18622687.

It is a cyclic number.

It is not a de Polignac number, because 78622681 - 2³ = 78622673 is a prime.

It is a super-2 number, since 2×78622681² = 12363051935255522, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (78622651) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 527595 + ... + 527743.

It is an arithmetic number, because the mean of its divisors is an integer number (5148000).

Almost surely, 2^78622681 is an apocalyptic number.

It is an amenable number.

78622681 is a deficient number, since it is larger than the sum of its proper divisors (3745319).

78622681 is a wasteful number, since it uses less digits than its factorization.

78622681 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 408.

The product of its digits is 64512, while the sum is 40.

The square root of 78622681 is about 8866.9431598494. The cubic root of 78622681 is about 428.3998232698.

The spelling of 78622681 in words is "seventy-eight million, six hundred twenty-two thousand, six hundred eighty-one".