78155050 has 12 divisors (see below), whose sum is σ = 145368486. Its totient is φ = 31262000.

The previous prime is 78155027. The next prime is 78155053. The reversal of 78155050 is 5055187.

It can be written as a sum of positive squares in 3 ways, for example, as 69505569 + 8649481 = 8337^2 + 2941^2 .

It is a super-2 number, since 2×78155050² = 12216423681005000, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (78155053) 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 5 ways as a sum of consecutive naturals, for example, 781501 + ... + 781600.

Almost surely, 2^78155050 is an apocalyptic number.

78155050 is a deficient number, since it is larger than the sum of its proper divisors (67213436).

78155050 is a wasteful number, since it uses less digits than its factorization.

78155050 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1563113 (or 1563108 counting only the distinct ones).

The product of its (nonzero) digits is 7000, while the sum is 31.

The square root of 78155050 is about 8840.5344861043. The cubic root of 78155050 is about 427.5487900723.

The spelling of 78155050 in words is "seventy-eight million, one hundred fifty-five thousand, fifty".