78225590 has 8 divisors (see below), whose sum is σ = 140806080. Its totient is φ = 31290232.

The previous prime is 78225569. The next prime is 78225601. The reversal of 78225590 is 9552287.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a super-2 number, since 2×78225590² = 12238485861696200, which contains 22 as substring.

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3911270 + ... + 3911289.

It is an arithmetic number, because the mean of its divisors is an integer number (17600760).

Almost surely, 2^78225590 is an apocalyptic number.

78225590 is a deficient number, since it is larger than the sum of its proper divisors (62580490).

78225590 is a wasteful number, since it uses less digits than its factorization.

78225590 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7822566.

The product of its (nonzero) digits is 50400, while the sum is 38.

The square root of 78225590 is about 8844.5231640830. The cubic root of 78225590 is about 427.6773815607.

The spelling of 78225590 in words is "seventy-eight million, two hundred twenty-five thousand, five hundred ninety".