2897780 has 12 divisors (see below), whose sum is σ = 6085380. Its totient is φ = 1159104.

The previous prime is 2897753. The next prime is 2897789. The reversal of 2897780 is 877982.

It can be written as a sum of positive squares in 2 ways, for example, as 1547536 + 1350244 = 1244^2 + 1162^2 .

It is a hoax number, since the sum of its digits (41) coincides with the sum of the digits of its distinct prime factors.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2897789) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 72425 + ... + 72464.

It is an arithmetic number, because the mean of its divisors is an integer number (507115).

2^2897780 is an apocalyptic number.

2897780 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

2897780 is an abundant number, since it is smaller than the sum of its proper divisors (3187600).

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

2897780 is a wasteful number, since it uses less digits than its factorization.

2897780 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 144898 (or 144896 counting only the distinct ones).

The product of its (nonzero) digits is 56448, while the sum is 41.

The square root of 2897780 is about 1702.2866973574. The cubic root of 2897780 is about 142.5679167377.

The spelling of 2897780 in words is "two million, eight hundred ninety-seven thousand, seven hundred eighty".