78135907 has 2 divisors, whose sum is σ = 78135908. Its totient is φ = 78135906.

The previous prime is 78135839. The next prime is 78135919. The reversal of 78135907 is 70953187.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 78135907 - 2¹⁹ = 77611619 is a prime.

It is a super-2 number, since 2×78135907² = 12210439925425298, which contains 22 as substring.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 78135907.

It is not a weakly prime, because it can be changed into another prime (78132907) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 39067953 + 39067954.

It is an arithmetic number, because the mean of its divisors is an integer number (39067954).

Almost surely, 2^78135907 is an apocalyptic number.

78135907 is a deficient number, since it is larger than the sum of its proper divisors (1).

78135907 is an equidigital number, since it uses as much as digits as its factorization.

78135907 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 52920, while the sum is 40.

The square root of 78135907 is about 8839.4517363918. The cubic root of 78135907 is about 427.5138798316.

The spelling of 78135907 in words is "seventy-eight million, one hundred thirty-five thousand, nine hundred seven".