78233155 has 96 divisors (see below), whose sum is σ = 134064000. Its totient is φ = 43464960.

The previous prime is 78233107. The next prime is 78233159. The reversal of 78233155 is 55133287.

It is not a de Polignac number, because 78233155 - 2¹⁹ = 77708867 is a prime.

It is a super-2 number, since 2×78233155² = 12240853082508050, which contains 22 as substring.

Its product of digits (25200) is a multiple of the sum of its prime factors (90).

It is a self number, because there is not a number n which added to its sum of digits gives 78233155.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (78233159) by changing a digit.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 2697681 + ... + 2697709.

It is an arithmetic number, because the mean of its divisors is an integer number (1396500).

Almost surely, 2^78233155 is an apocalyptic number.

78233155 is a deficient number, since it is larger than the sum of its proper divisors (55830845).

78233155 is a wasteful number, since it uses less digits than its factorization.

78233155 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 90 (or 65 counting only the distinct ones).

The product of its digits is 25200, while the sum is 34.

The square root of 78233155 is about 8844.9508195354. The cubic root of 78233155 is about 427.6911676508.

The spelling of 78233155 in words is "seventy-eight million, two hundred thirty-three thousand, one hundred fifty-five".