78120250 has 72 divisors (see below), whose sum is σ = 162124092. Its totient is φ = 28173600.

The previous prime is 78120241. The next prime is 78120271. The reversal of 78120250 is 5202187.

It can be written as a sum of positive squares in 6 ways, for example, as 3418801 + 74701449 = 1849^2 + 8643^2 .

It is a super-2 number, since 2×78120250² = 12205546920125000, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (25).

It is an unprimeable number.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 1816729 + ... + 1816771.

Almost surely, 2^78120250 is an apocalyptic number.

78120250 is an abundant number, since it is smaller than the sum of its proper divisors (84003842).

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

78120250 is a wasteful number, since it uses less digits than its factorization.

78120250 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 129 (or 63 counting only the distinct ones).

The product of its (nonzero) digits is 1120, while the sum is 25.

The square root of 78120250 is about 8838.5660601706. The cubic root of 78120250 is about 427.4853226155.

The spelling of 78120250 in words is "seventy-eight million, one hundred twenty thousand, two hundred fifty".