78672811 has 8 divisors (see below), whose sum is σ = 93821184. Its totient is φ = 64501800.

The previous prime is 78672799. The next prime is 78672851. The reversal of 78672811 is 11827687.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 78672811 - 2⁵ = 78672779 is a prime.

It is a super-2 number, since 2×78672811² = 12378822381283442, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (78672851) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 244165 + ... + 244486.

It is an arithmetic number, because the mean of its divisors is an integer number (11727648).

Almost surely, 2^78672811 is an apocalyptic number.

78672811 is a deficient number, since it is larger than the sum of its proper divisors (15148373).

78672811 is a wasteful number, since it uses less digits than its factorization.

78672811 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 488681.

The product of its digits is 37632, while the sum is 40.

The square root of 78672811 is about 8869.7695009510. The cubic root of 78672811 is about 428.4908534924.

The spelling of 78672811 in words is "seventy-eight million, six hundred seventy-two thousand, eight hundred eleven".