78387270 has 48 divisors (see below), whose sum is σ = 203727312. Its totient is φ = 19294080.

The previous prime is 78387229. The next prime is 78387277. The reversal of 78387270 is 7278387.

It is a super-2 number, since 2×78387270² = 12289128196105800, which contains 22 as substring.

It is an alternating number because its digits alternate between odd and even.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (78387277) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 2661 + ... + 12800.

It is an arithmetic number, because the mean of its divisors is an integer number (4244319).

Almost surely, 2^78387270 is an apocalyptic number.

78387270 is an abundant number, since it is smaller than the sum of its proper divisors (125340042).

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

78387270 is a wasteful number, since it uses less digits than its factorization.

78387270 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15497 (or 15484 counting only the distinct ones).

The product of its (nonzero) digits is 131712, while the sum is 42.

The square root of 78387270 is about 8853.6585658133. The cubic root of 78387270 is about 427.9718261071.

The spelling of 78387270 in words is "seventy-eight million, three hundred eighty-seven thousand, two hundred seventy".