71780070 has 16 divisors (see below), whose sum is σ = 172272240. Its totient is φ = 19141344.

The previous prime is 71780063. The next prime is 71780087. The reversal of 71780070 is 7008717.

It is a Harshad number since it is a multiple of its sum of digits (30), and also a Moran number because the ratio is a prime number: 2392669 = 71780070 / (7 + 1 + 7 + 8 + 0 + 0 + 7 + 0).

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1196305 + ... + 1196364.

It is an arithmetic number, because the mean of its divisors is an integer number (10767015).

Almost surely, 2^71780070 is an apocalyptic number.

71780070 is an abundant number, since it is smaller than the sum of its proper divisors (100492170).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

71780070 is a wasteful number, since it uses less digits than its factorization.

71780070 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2392679.

The product of its (nonzero) digits is 2744, while the sum is 30.

The square root of 71780070 is about 8472.3119630948. The cubic root of 71780070 is about 415.5927466256.

Adding to 71780070 its reverse (7008717), we get a palindrome (78788787).

The spelling of 71780070 in words is "seventy-one million, seven hundred eighty thousand, seventy".