91672197970 has 8 divisors (see below), whose sum is σ = 165009956364. Its totient is φ = 36668879184.

The previous prime is 91672197949. The next prime is 91672197971. The reversal of 91672197970 is 7979127619.

It can be written as a sum of positive squares in 2 ways, for example, as 83070191961 + 8602006009 = 288219^2 + 92747^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is not an unprimeable number, because it can be changed into a prime (91672197971) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4583609889 + ... + 4583609908.

Almost surely, 2^91672197970 is an apocalyptic number.

91672197970 is a deficient number, since it is larger than the sum of its proper divisors (73337758394).

91672197970 is a wasteful number, since it uses less digits than its factorization.

91672197970 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9167219804.

The product of its (nonzero) digits is 3000564, while the sum is 58.

The spelling of 91672197970 in words is "ninety-one billion, six hundred seventy-two million, one hundred ninety-seven thousand, nine hundred seventy".