78270520 has 16 divisors (see below), whose sum is σ = 176108760. Its totient is φ = 31308192.

The previous prime is 78270487. The next prime is 78270523. The reversal of 78270520 is 2507287.

It is a super-2 number, since 2×78270520² = 12252548602140800, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (78270523) 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, 978342 + ... + 978421.

Almost surely, 2^78270520 is an apocalyptic number.

It is an amenable number.

78270520 is an abundant number, since it is smaller than the sum of its proper divisors (97838240).

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

78270520 is a wasteful number, since it uses less digits than its factorization.

78270520 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1956774 (or 1956770 counting only the distinct ones).

The product of its (nonzero) digits is 7840, while the sum is 31.

The square root of 78270520 is about 8847.0627894234. The cubic root of 78270520 is about 427.7592467876.

The spelling of 78270520 in words is "seventy-eight million, two hundred seventy thousand, five hundred twenty".