78637890 has 16 divisors (see below), whose sum is σ = 188731008. Its totient is φ = 20970096.

The previous prime is 78637837. The next prime is 78637891. The reversal of 78637890 is 9873687.

It is not an unprimeable number, because it can be changed into a prime (78637891) 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, 1310602 + ... + 1310661.

It is an arithmetic number, because the mean of its divisors is an integer number (11795688).

Almost surely, 2^78637890 is an apocalyptic number.

78637890 is an abundant number, since it is smaller than the sum of its proper divisors (110093118).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

78637890 is a wasteful number, since it uses less digits than its factorization.

78637890 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2621273.

The product of its (nonzero) digits is 508032, while the sum is 48.

The square root of 78637890 is about 8867.8007420104. The cubic root of 78637890 is about 428.4274451246.

It can be divided in two parts, 7863 and 7890, that added together give a triangular number (15753 = T₁₇₇).

The spelling of 78637890 in words is "seventy-eight million, six hundred thirty-seven thousand, eight hundred ninety".