97778062172 has 48 divisors (see below), whose sum is σ = 210453905088. Its totient is φ = 38793323520.

The previous prime is 97778062097. The next prime is 97778062199. The reversal of 97778062172 is 27126087779.

It is a happy number.

It is a super-2 number, since 2×97778062172² (a number of 23 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1654703 + ... + 1712774.

It is an arithmetic number, because the mean of its divisors is an integer number (4384456356).

Almost surely, 2^97778062172 is an apocalyptic number.

It is an amenable number.

97778062172 is an abundant number, since it is smaller than the sum of its proper divisors (112675842916).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

97778062172 is a wasteful number, since it uses less digits than its factorization.

97778062172 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3367566 (or 3367564 counting only the distinct ones).

The product of its (nonzero) digits is 4148928, while the sum is 56.

The spelling of 97778062172 in words is "ninety-seven billion, seven hundred seventy-eight million, sixty-two thousand, one hundred seventy-two".