368664781 has 4 divisors (see below), whose sum is σ = 378628732. Its totient is φ = 358700832.

The previous prime is 368664749. The next prime is 368664787. The reversal of 368664781 is 187466863.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 187466863 = 19 ⋅9866677.

It can be written as a sum of positive squares in 2 ways, for example, as 292102281 + 76562500 = 17091^2 + 8750^2 .

It is a cyclic number.

It is not a de Polignac number, because 368664781 - 2⁵ = 368664749 is a prime.

It is a super-2 number, since 2×368664781² = 271827441499555922, which 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 (368664787) 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, 4981920 + ... + 4981993.

It is an arithmetic number, because the mean of its divisors is an integer number (94657183).

Almost surely, 2^368664781 is an apocalyptic number.

It is an amenable number.

368664781 is a deficient number, since it is larger than the sum of its proper divisors (9963951).

368664781 is an equidigital number, since it uses as much as digits as its factorization.

368664781 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9963950.

The product of its digits is 1161216, while the sum is 49.

The square root of 368664781 is about 19200.6453276967. The cubic root of 368664781 is about 717.0408258847.

The spelling of 368664781 in words is "three hundred sixty-eight million, six hundred sixty-four thousand, seven hundred eighty-one".