91428070 has 16 divisors (see below), whose sum is σ = 164715120. Its totient is φ = 36539104.

The previous prime is 91428067. The next prime is 91428089. The reversal of 91428070 is 7082419.

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, 10401 + ... + 17059.

It is an arithmetic number, because the mean of its divisors is an integer number (10294695).

Almost surely, 2^91428070 is an apocalyptic number.

91428070 is a deficient number, since it is larger than the sum of its proper divisors (73287050).

91428070 is a wasteful number, since it uses less digits than its factorization.

91428070 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8039.

The product of its (nonzero) digits is 4032, while the sum is 31.

The square root of 91428070 is about 9561.8026543116. The cubic root of 91428070 is about 450.4983286072.

The spelling of 91428070 in words is "ninety-one million, four hundred twenty-eight thousand, seventy".