2781213507 has 12 divisors (see below), whose sum is σ = 4019413944. Its totient is φ = 1853170560.

The previous prime is 2781213499. The next prime is 2781213509. The reversal of 2781213507 is 7053121872.

2781213507 is a `hidden beast` number, since 27 + 8 + 121 + 3 + 507 = 666.

It is not a de Polignac number, because 2781213507 - 2³ = 2781213499 is a prime.

It is not an unprimeable number, because it can be changed into a prime (2781213509) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 62638 + ... + 97395.

It is an arithmetic number, because the mean of its divisors is an integer number (334951162).

Almost surely, 2^2781213507 is an apocalyptic number.

2781213507 is a deficient number, since it is larger than the sum of its proper divisors (1238200437).

2781213507 is a wasteful number, since it uses less digits than its factorization.

2781213507 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 161970 (or 161967 counting only the distinct ones).

The product of its (nonzero) digits is 23520, while the sum is 36.

The square root of 2781213507 is about 52737.2117863658. The cubic root of 2781213507 is about 1406.3004313055.

The spelling of 2781213507 in words is "two billion, seven hundred eighty-one million, two hundred thirteen thousand, five hundred seven".