2758729 has 4 divisors (see below), whose sum is σ = 2779920. Its totient is φ = 2737540.

The previous prime is 2758711. The next prime is 2758771. The reversal of 2758729 is 9278572.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 2758729 - 2¹¹ = 2756681 is a prime.

It is a super-2 number, since 2×2758729² = 15221171390882, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 2758691 and 2758700.

It is not an unprimeable number, because it can be changed into a prime (2758429) 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, 10399 + ... + 10660.

It is an arithmetic number, because the mean of its divisors is an integer number (694980).

2^2758729 is an apocalyptic number.

It is an amenable number.

2758729 is a deficient number, since it is larger than the sum of its proper divisors (21191).

2758729 is a wasteful number, since it uses less digits than its factorization.

2758729 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21190.

The product of its digits is 70560, while the sum is 40.

The square root of 2758729 is about 1660.9422024863. The cubic root of 2758729 is about 140.2500463373.

The spelling of 2758729 in words is "two million, seven hundred fifty-eight thousand, seven hundred twenty-nine".