97723640 has 96 divisors (see below), whose sum is σ = 259660080. Its totient is φ = 32997888.

The previous prime is 97723621. The next prime is 97723657. The reversal of 97723640 is 4632779.

It is a junction number, because it is equal to n+sod(n) for n = 97723594 and 97723603.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 142739 + ... + 143421.

Almost surely, 2^97723640 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 97723640, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (129830040).

97723640 is an abundant number, since it is smaller than the sum of its proper divisors (161936440).

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

97723640 is a wasteful number, since it uses less digits than its factorization.

97723640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 781 (or 770 counting only the distinct ones).

The product of its (nonzero) digits is 63504, while the sum is 38.

The square root of 97723640 is about 9885.5267942584. The cubic root of 97723640 is about 460.6098401768.

The spelling of 97723640 in words is "ninety-seven million, seven hundred twenty-three thousand, six hundred forty".