246640644 has 18 divisors (see below), whose sum is σ = 623452830. Its totient is φ = 82213536.

The previous prime is 246640633. The next prime is 246640649. The reversal of 246640644 is 446046642.

It is a happy number.

246640644 is a `hidden beast` number, since 2 + 4 + 6 + 6 + 4 + 0 + 644 = 666.

It can be written as a sum of positive squares in only one way, i.e., 140138244 + 106502400 = 11838^2 + 10320^2 .

It is a tau number, because it is divible by the number of its divisors (18).

It is a Harshad number since it is a multiple of its sum of digits (36), and also a Moran number because the ratio is a prime number: 6851129 = 246640644 / (2 + 4 + 6 + 6 + 4 + 0 + 6 + 4 + 4).

It is a junction number, because it is equal to n+sod(n) for n = 246640599 and 246640608.

It is not an unprimeable number, because it can be changed into a prime (246640649) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 3425529 + ... + 3425600.

Almost surely, 2^246640644 is an apocalyptic number.

It is an amenable number.

246640644 is an abundant number, since it is smaller than the sum of its proper divisors (376812186).

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

246640644 is a wasteful number, since it uses less digits than its factorization.

246640644 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6851139 (or 6851134 counting only the distinct ones).

The product of its (nonzero) digits is 110592, while the sum is 36.

The square root of 246640644 is about 15704.7968468236. The cubic root of 246640644 is about 627.1261088037.

The spelling of 246640644 in words is "two hundred forty-six million, six hundred forty thousand, six hundred forty-four".