155649988 has 12 divisors (see below), whose sum is σ = 293340460. Its totient is φ = 71838432.

The previous prime is 155649971. The next prime is 155650013. The reversal of 155649988 is 889946551.

It can be written as a sum of positive squares in 2 ways, for example, as 84787264 + 70862724 = 9208^2 + 8418^2 .

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, 1496583 + ... + 1496686.

Almost surely, 2^155649988 is an apocalyptic number.

It is an amenable number.

155649988 is a deficient number, since it is larger than the sum of its proper divisors (137690472).

155649988 is a wasteful number, since it uses less digits than its factorization.

155649988 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2993286 (or 2993284 counting only the distinct ones).

The product of its digits is 3110400, while the sum is 55.

The square root of 155649988 is about 12475.9764347325. The cubic root of 155649988 is about 537.9183552395.

It can be divided in two parts, 15564 and 9988, that added together give a palindrome (25552).

The spelling of 155649988 in words is "one hundred fifty-five million, six hundred forty-nine thousand, nine hundred eighty-eight".