1997751600 has 840 divisors, whose sum is σ = 8470207872. Its totient is φ = 447897600.

The previous prime is 1997751589. The next prime is 1997751601. The reversal of 1997751600 is 61577991.

It is a super-2 number, since 2×1997751600² = 7982022910605120000, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is not an unprimeable number, because it can be changed into a prime (1997751601) by changing a digit.

It is a polite number, since it can be written in 167 ways as a sum of consecutive naturals, for example, 64443585 + ... + 64443615.

Almost surely, 2^1997751600 is an apocalyptic number.

1997751600 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1997751600, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (4235103936).

1997751600 is an abundant number, since it is smaller than the sum of its proper divisors (6472456272).

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

1997751600 is a wasteful number, since it uses less digits than its factorization.

1997751600 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 97 (or 71 counting only the distinct ones).

The product of its (nonzero) digits is 119070, while the sum is 45.

The square root of 1997751600 is about 44696.2146048186. The cubic root of 1997751600 is about 1259.4487384450.

The spelling of 1997751600 in words is "one billion, nine hundred ninety-seven million, seven hundred fifty-one thousand, six hundred".