78252555 has 16 divisors (see below), whose sum is σ = 130648320. Its totient is φ = 39919968.

The previous prime is 78252553. The next prime is 78252557. The reversal of 78252555 is 55525287.

78252555 = 465² + 466² + ... + 694².

It is an interprime number because it is at equal distance from previous prime (78252553) and next prime (78252557).

It is not a de Polignac number, because 78252555 - 2¹ = 78252553 is a prime.

It is a super-2 number, since 2×78252555² = 12246924728056050, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (78252553) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 113065 + ... + 113754.

It is an arithmetic number, because the mean of its divisors is an integer number (8165520).

Almost surely, 2^78252555 is an apocalyptic number.

78252555 is a deficient number, since it is larger than the sum of its proper divisors (52395765).

78252555 is a wasteful number, since it uses less digits than its factorization.

78252555 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 226850.

The product of its digits is 140000, while the sum is 39.

The square root of 78252555 is about 8846.0474224368. The cubic root of 78252555 is about 427.7265172112.

The spelling of 78252555 in words is "seventy-eight million, two hundred fifty-two thousand, five hundred fifty-five".