81039070 has 16 divisors (see below), whose sum is σ = 166709088. Its totient is φ = 27784800.

The previous prime is 81039043. The next prime is 81039107. The reversal of 81039070 is 7093018.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 578781 + ... + 578920.

It is an arithmetic number, because the mean of its divisors is an integer number (10419318).

Almost surely, 2^81039070 is an apocalyptic number.

81039070 is an abundant number, since it is smaller than the sum of its proper divisors (85670018).

81039070 is a wasteful number, since it uses less digits than its factorization.

81039070 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1157715.

The product of its (nonzero) digits is 1512, while the sum is 28.

The square root of 81039070 is about 9002.1702938791. The cubic root of 81039070 is about 432.7444261950.

The spelling of 81039070 in words is "eighty-one million, thirty-nine thousand, seventy".