78225020 has 12 divisors (see below), whose sum is σ = 164272584. Its totient is φ = 31290000.

The previous prime is 78225019. The next prime is 78225029. The reversal of 78225020 is 2052287.

It is a super-2 number, since 2×78225020² = 12238307508000800, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (78225029) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1955606 + ... + 1955645.

It is an arithmetic number, because the mean of its divisors is an integer number (13689382).

Almost surely, 2^78225020 is an apocalyptic number.

It is an amenable number.

78225020 is an abundant number, since it is smaller than the sum of its proper divisors (86047564).

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

78225020 is a wasteful number, since it uses less digits than its factorization.

78225020 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3911260 (or 3911258 counting only the distinct ones).

The product of its (nonzero) digits is 2240, while the sum is 26.

The square root of 78225020 is about 8844.4909406930. The cubic root of 78225020 is about 427.6763427843.

It can be divided in two parts, 782 and 25020, that multiplied together give a triangular number (19565640 = T₆₂₅₅).

The spelling of 78225020 in words is "seventy-eight million, two hundred twenty-five thousand, twenty".