78207790 has 16 divisors (see below), whose sum is σ = 140880240. Its totient is φ = 31259520.

The previous prime is 78207763. The next prime is 78207793. The reversal of 78207790 is 9770287.

It is a super-2 number, since 2×78207790² = 12232916833368200, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (78207793) 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, 18166 + ... + 22054.

It is an arithmetic number, because the mean of its divisors is an integer number (8805015).

Almost surely, 2^78207790 is an apocalyptic number.

78207790 is a deficient number, since it is larger than the sum of its proper divisors (62672450).

78207790 is a wasteful number, since it uses less digits than its factorization.

78207790 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5907.

The product of its (nonzero) digits is 49392, while the sum is 40.

The square root of 78207790 is about 8843.5168343821. The cubic root of 78207790 is about 427.6449401952.

The spelling of 78207790 in words is "seventy-eight million, two hundred seven thousand, seven hundred ninety".