97549694578 has 32 divisors (see below), whose sum is σ = 170122613760. Its totient is φ = 41087450880.

The previous prime is 97549694573. The next prime is 97549694579. The reversal of 97549694578 is 87549694579.

It is a super-2 number, since 2×97549694578² (a number of 23 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (73).

It is a self number, because there is not a number n which added to its sum of digits gives 97549694578.

It is not an unprimeable number, because it can be changed into a prime (97549694573) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 117343 + ... + 457021.

It is an arithmetic number, because the mean of its divisors is an integer number (5316331680).

Almost surely, 2^97549694578 is an apocalyptic number.

97549694578 is a deficient number, since it is larger than the sum of its proper divisors (72572919182).

97549694578 is a wasteful number, since it uses less digits than its factorization.

97549694578 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 340042.

The product of its digits is 685843200, while the sum is 73.

Subtracting from 97549694578 its reverse (87549694579), we obtain a palindrome (9999999999).

The spelling of 97549694578 in words is "ninety-seven billion, five hundred forty-nine million, six hundred ninety-four thousand, five hundred seventy-eight".