78945902 has 16 divisors (see below), whose sum is σ = 139702272. Its totient is φ = 32742360.

The previous prime is 78945877. The next prime is 78945907. The reversal of 78945902 is 20954987.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (78945907) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 90518 + ... + 91385.

It is an arithmetic number, because the mean of its divisors is an integer number (8731392).

Almost surely, 2^78945902 is an apocalyptic number.

78945902 is a deficient number, since it is larger than the sum of its proper divisors (60756370).

78945902 is a wasteful number, since it uses less digits than its factorization.

78945902 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 181943.

The product of its (nonzero) digits is 181440, while the sum is 44.

The square root of 78945902 is about 8885.1506458810. The cubic root of 78945902 is about 428.9860769258.

The spelling of 78945902 in words is "seventy-eight million, nine hundred forty-five thousand, nine hundred two".