78902642 has 24 divisors (see below), whose sum is σ = 148269996. Its totient is φ = 31213728.

The previous prime is 78902641. The next prime is 78902653. The reversal of 78902642 is 24620987.

It can be written as a sum of positive squares in 2 ways, for example, as 74978281 + 3924361 = 8659^2 + 1981^2 .

It is a junction number, because it is equal to n+sod(n) for n = 78902596 and 78902605.

It is not an unprimeable number, because it can be changed into a prime (78902641) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 29693 + ... + 32240.

Almost surely, 2^78902642 is an apocalyptic number.

78902642 is a deficient number, since it is larger than the sum of its proper divisors (69367354).

78902642 is a wasteful number, since it uses less digits than its factorization.

78902642 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 61962 (or 61955 counting only the distinct ones).

The product of its (nonzero) digits is 48384, while the sum is 38.

The square root of 78902642 is about 8882.7159135030. The cubic root of 78902642 is about 428.9077054166.

The spelling of 78902642 in words is "seventy-eight million, nine hundred two thousand, six hundred forty-two".