78827431 has 2 divisors, whose sum is σ = 78827432. Its totient is φ = 78827430.

The previous prime is 78827401. The next prime is 78827477. The reversal of 78827431 is 13472887.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 78827431 - 2¹⁵ = 78794663 is a prime.

It is a super-2 number, since 2×78827431² = 12427527756119522, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (78827401) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 39413715 + 39413716.

It is an arithmetic number, because the mean of its divisors is an integer number (39413716).

Almost surely, 2^78827431 is an apocalyptic number.

78827431 is a deficient number, since it is larger than the sum of its proper divisors (1).

78827431 is an equidigital number, since it uses as much as digits as its factorization.

78827431 is an evil number, because the sum of its binary digits is even.

The product of its digits is 75264, while the sum is 40.

The square root of 78827431 is about 8878.4813453653. The cubic root of 78827431 is about 428.7713820025.

The spelling of 78827431 in words is "seventy-eight million, eight hundred twenty-seven thousand, four hundred thirty-one".