78072851 has 2 divisors, whose sum is σ = 78072852. Its totient is φ = 78072850.

The previous prime is 78072811. The next prime is 78072859. The reversal of 78072851 is 15827087.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 78072851 - 2²² = 73878547 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (78072859) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 39036425 + 39036426.

It is an arithmetic number, because the mean of its divisors is an integer number (39036426).

Almost surely, 2^78072851 is an apocalyptic number.

78072851 is a deficient number, since it is larger than the sum of its proper divisors (1).

78072851 is an equidigital number, since it uses as much as digits as its factorization.

78072851 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 31360, while the sum is 38.

The square root of 78072851 is about 8835.8842794595. The cubic root of 78072851 is about 427.3988470592.

The spelling of 78072851 in words is "seventy-eight million, seventy-two thousand, eight hundred fifty-one".