97726791890 has 128 divisors (see below), whose sum is σ = 222084495360. Its totient is φ = 30133555200.

The previous prime is 97726791881. The next prime is 97726791937. The reversal of 97726791890 is 9819762779.

It is a super-2 number, since 2×97726791890² (a number of 23 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (65).

It is an unprimeable number.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 38763830 + ... + 38766350.

It is an arithmetic number, because the mean of its divisors is an integer number (1735035120).

Almost surely, 2^97726791890 is an apocalyptic number.

97726791890 is an abundant number, since it is smaller than the sum of its proper divisors (124357703470).

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

97726791890 is a wasteful number, since it uses less digits than its factorization.

97726791890 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3628.

The product of its (nonzero) digits is 24004512, while the sum is 65.

The spelling of 97726791890 in words is "ninety-seven billion, seven hundred twenty-six million, seven hundred ninety-one thousand, eight hundred ninety".