155278783 has 16 divisors (see below), whose sum is σ = 176596992. Its totient is φ = 135252000.

The previous prime is 155278777. The next prime is 155278793. The reversal of 155278783 is 387872551.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-155278783 is a prime.

It is a super-3 number, since 3×155278783³ (a number of 26 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (155278723) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 32913 + ... + 37333.

It is an arithmetic number, because the mean of its divisors is an integer number (11037312).

Almost surely, 2^155278783 is an apocalyptic number.

155278783 is a deficient number, since it is larger than the sum of its proper divisors (21318209).

155278783 is a wasteful number, since it uses less digits than its factorization.

155278783 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4566.

The product of its digits is 470400, while the sum is 46.

The square root of 155278783 is about 12461.0907628506. The cubic root of 155278783 is about 537.4903930499.

It can be divided in two parts, 15527 and 8783, that added together give a triangular number (24310 = T₂₂₀).

The spelling of 155278783 in words is "one hundred fifty-five million, two hundred seventy-eight thousand, seven hundred eighty-three".