81355070 has 16 divisors (see below), whose sum is σ = 150011568. Its totient is φ = 31748160.

The previous prime is 81355037. The next prime is 81355133. The reversal of 81355070 is 7055318.

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, 98804 + ... + 99623.

It is an arithmetic number, because the mean of its divisors is an integer number (9375723).

Almost surely, 2^81355070 is an apocalyptic number.

81355070 is a deficient number, since it is larger than the sum of its proper divisors (68656498).

81355070 is a wasteful number, since it uses less digits than its factorization.

81355070 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 198475.

The product of its (nonzero) digits is 4200, while the sum is 29.

The square root of 81355070 is about 9019.7045406155. The cubic root of 81355070 is about 433.3061712100.

The spelling of 81355070 in words is "eighty-one million, three hundred fifty-five thousand, seventy".