897099840 has 672 divisors, whose sum is σ = 3988978560. Its totient is φ = 188116992.

The previous prime is 897099829. The next prime is 897099851. The reversal of 897099840 is 48990798.

It is an interprime number because it is at equal distance from previous prime (897099829) and next prime (897099851).

It is a tau number, because it is divible by the number of its divisors (672).

It is a Smith number, since the sum of its digits (54) coincides with the sum of the digits of its prime factors.

It is a Harshad number since it is a multiple of its sum of digits (54).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 5503599 + ... + 5503761.

It is an arithmetic number, because the mean of its divisors is an integer number (5935980).

Almost surely, 2^897099840 is an apocalyptic number.

897099840 is a gapful number since it is divisible by the number (80) 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 897099840, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1994489280).

897099840 is an abundant number, since it is smaller than the sum of its proper divisors (3091878720).

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

897099840 is a wasteful number, since it uses less digits than its factorization.

897099840 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 216 (or 193 counting only the distinct ones).

The product of its (nonzero) digits is 1306368, while the sum is 54.

The square root of 897099840 is about 29951.6249976525. The cubic root of 897099840 is about 964.4512043308.

The spelling of 897099840 in words is "eight hundred ninety-seven million, ninety-nine thousand, eight hundred forty".