7264881781 has 4 divisors (see below), whose sum is σ = 7647244000. Its totient is φ = 6882519564.

The previous prime is 7264881763. The next prime is 7264881787. The reversal of 7264881781 is 1871884627.

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 7264881781 - 2⁷ = 7264881653 is a prime.

It is a super-2 number, since 2×7264881781² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (7264881787) 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, 191181081 + ... + 191181118.

It is an arithmetic number, because the mean of its divisors is an integer number (1911811000).

Almost surely, 2^7264881781 is an apocalyptic number.

It is an amenable number.

7264881781 is a deficient number, since it is larger than the sum of its proper divisors (382362219).

7264881781 is a wasteful number, since it uses less digits than its factorization.

7264881781 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 382362218.

The product of its digits is 1204224, while the sum is 52.

The square root of 7264881781 is about 85234.2758577792. The cubic root of 7264881781 is about 1936.7616805088.

The spelling of 7264881781 in words is "seven billion, two hundred sixty-four million, eight hundred eighty-one thousand, seven hundred eighty-one".