155278240 has 48 divisors (see below), whose sum is σ = 395068968. Its totient is φ = 57332736.

The previous prime is 155278231. The next prime is 155278243. The reversal of 155278240 is 42872551.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 122146704 + 33131536 = 11052^2 + 5756^2 .

It is a super-2 number, since 2×155278240² = 48222663634995200, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 155278196 and 155278205.

It is not an unprimeable number, because it can be changed into a prime (155278243) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 35247 + ... + 39406.

Almost surely, 2^155278240 is an apocalyptic number.

155278240 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

155278240 is an abundant number, since it is smaller than the sum of its proper divisors (239790728).

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

155278240 is a wasteful number, since it uses less digits than its factorization.

155278240 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 74681 (or 74673 counting only the distinct ones).

The product of its (nonzero) digits is 22400, while the sum is 34.

The square root of 155278240 is about 12461.0689750117. The cubic root of 155278240 is about 537.4897665259.

The spelling of 155278240 in words is "one hundred fifty-five million, two hundred seventy-eight thousand, two hundred forty".