78223653 has 12 divisors (see below), whose sum is σ = 113357088. Its totient is φ = 51979560.

The previous prime is 78223603. The next prime is 78223669. The reversal of 78223653 is 35632287.

It is not a de Polignac number, because 78223653 - 2⁹ = 78223141 is a prime.

It is a super-2 number, since 2×78223653² = 12237879777328818, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (78223603) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 11175 + ... + 16772.

It is an arithmetic number, because the mean of its divisors is an integer number (9446424).

Almost surely, 2^78223653 is an apocalyptic number.

It is an amenable number.

78223653 is a deficient number, since it is larger than the sum of its proper divisors (35133435).

78223653 is a wasteful number, since it uses less digits than its factorization.

78223653 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 28264 (or 28261 counting only the distinct ones).

The product of its digits is 60480, while the sum is 36.

The square root of 78223653 is about 8844.4136606109. The cubic root of 78223653 is about 427.6738515227.

The spelling of 78223653 in words is "seventy-eight million, two hundred twenty-three thousand, six hundred fifty-three".