91690070 has 16 divisors (see below), whose sum is σ = 169503408. Its totient is φ = 35684640.

The previous prime is 91690057. The next prime is 91690073. The reversal of 91690070 is 7009619.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (91690073) 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, 123536 + ... + 124275.

It is an arithmetic number, because the mean of its divisors is an integer number (10593963).

Almost surely, 2^91690070 is an apocalyptic number.

91690070 is a deficient number, since it is larger than the sum of its proper divisors (77813338).

91690070 is a wasteful number, since it uses less digits than its factorization.

91690070 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 247855.

The product of its (nonzero) digits is 3402, while the sum is 32.

The square root of 91690070 is about 9575.4931987862. The cubic root of 91690070 is about 450.9282403285.

Adding to 91690070 its reverse (7009619), we get a palindrome (98699689).

The spelling of 91690070 in words is "ninety-one million, six hundred ninety thousand, seventy".