155240644 has 12 divisors (see below), whose sum is σ = 292569004. Its totient is φ = 71649504.

The previous prime is 155240599. The next prime is 155240663. The reversal of 155240644 is 446042551.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 18818244 + 136422400 = 4338^2 + 11680^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1492647 + ... + 1492750.

Almost surely, 2^155240644 is an apocalyptic number.

It is an amenable number.

155240644 is a deficient number, since it is larger than the sum of its proper divisors (137328360).

155240644 is a wasteful number, since it uses less digits than its factorization.

155240644 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2985414 (or 2985412 counting only the distinct ones).

The product of its (nonzero) digits is 19200, while the sum is 31.

The square root of 155240644 is about 12459.5603453733. The cubic root of 155240644 is about 537.4463839795.

The spelling of 155240644 in words is "one hundred fifty-five million, two hundred forty thousand, six hundred forty-four".