81078070 has 16 divisors (see below), whose sum is σ = 147091968. Its totient is φ = 32175360.

The previous prime is 81078061. The next prime is 81078071. The reversal of 81078070 is 7087018.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81078071) 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, 30651 + ... + 33190.

It is an arithmetic number, because the mean of its divisors is an integer number (9193248).

Almost surely, 2^81078070 is an apocalyptic number.

81078070 is a deficient number, since it is larger than the sum of its proper divisors (66013898).

81078070 is a wasteful number, since it uses less digits than its factorization.

81078070 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 63975.

The product of its (nonzero) digits is 3136, while the sum is 31.

The square root of 81078070 is about 9004.3361776424. The cubic root of 81078070 is about 432.8138343871.

The spelling of 81078070 in words is "eighty-one million, seventy-eight thousand, seventy".