78253620 has 24 divisors (see below), whose sum is σ = 219110304. Its totient is φ = 20867616.

The previous prime is 78253603. The next prime is 78253621. The reversal of 78253620 is 2635287.

It is a super-2 number, since 2×78253620² = 12247258086208800, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (78253621) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 652054 + ... + 652173.

It is an arithmetic number, because the mean of its divisors is an integer number (9129596).

Almost surely, 2^78253620 is an apocalyptic number.

It is an amenable number.

78253620 is an abundant number, since it is smaller than the sum of its proper divisors (140856684).

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

78253620 is a wasteful number, since it uses less digits than its factorization.

78253620 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1304239 (or 1304237 counting only the distinct ones).

The product of its (nonzero) digits is 20160, while the sum is 33.

The square root of 78253620 is about 8846.1076186083. The cubic root of 78253620 is about 427.7284576236.

The spelling of 78253620 in words is "seventy-eight million, two hundred fifty-three thousand, six hundred twenty".