78492225 has 48 divisors (see below), whose sum is σ = 149101568. Its totient is φ = 35691840.

The previous prime is 78492221. The next prime is 78492233. The reversal of 78492225 is 52229487.

It is not a de Polignac number, because 78492225 - 2² = 78492221 is a prime.

It is a super-2 number, since 2×78492225² = 12322058770901250, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (78492221) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 160932 + ... + 161418.

Almost surely, 2^78492225 is an apocalyptic number.

78492225 is a gapful number since it is divisible by the number (75) formed by its first and last digit.

It is an amenable number.

78492225 is a deficient number, since it is larger than the sum of its proper divisors (70609343).

78492225 is a wasteful number, since it uses less digits than its factorization.

78492225 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 814 (or 809 counting only the distinct ones).

The product of its digits is 80640, while the sum is 39.

The square root of 78492225 is about 8859.5837938359. The cubic root of 78492225 is about 428.1627489048.

The spelling of 78492225 in words is "seventy-eight million, four hundred ninety-two thousand, two hundred twenty-five".