78288902 has 4 divisors (see below), whose sum is σ = 117433356. Its totient is φ = 39144450.

The previous prime is 78288877. The next prime is 78288943. The reversal of 78288902 is 20988287.

It is a semiprime because it is the product of two primes.

It is a super-2 number, since 2×78288902² = 12258304352731208, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 19572224 + ... + 19572227.

It is an arithmetic number, because the mean of its divisors is an integer number (29358339).

Almost surely, 2^78288902 is an apocalyptic number.

78288902 is a deficient number, since it is larger than the sum of its proper divisors (39144454).

78288902 is a wasteful number, since it uses less digits than its factorization.

78288902 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 39144453.

The product of its (nonzero) digits is 129024, while the sum is 44.

The square root of 78288902 is about 8848.1016042991. The cubic root of 78288902 is about 427.7927308929.

The spelling of 78288902 in words is "seventy-eight million, two hundred eighty-eight thousand, nine hundred two".