78225031 has 4 divisors (see below), whose sum is σ = 79326864. Its totient is φ = 77123200.

The previous prime is 78225029. The next prime is 78225073. The reversal of 78225031 is 13052287.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 13052287 = 509 ⋅25643.

It is a cyclic number.

It is not a de Polignac number, because 78225031 - 2¹ = 78225029 is a prime.

It is a super-2 number, since 2×78225031² = 12238310949901922, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (78225131) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 550810 + ... + 550951.

It is an arithmetic number, because the mean of its divisors is an integer number (19831716).

Almost surely, 2^78225031 is an apocalyptic number.

78225031 is a gapful number since it is divisible by the number (71) formed by its first and last digit.

78225031 is a deficient number, since it is larger than the sum of its proper divisors (1101833).

78225031 is a wasteful number, since it uses less digits than its factorization.

78225031 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1101832.

The product of its (nonzero) digits is 3360, while the sum is 28.

The square root of 78225031 is about 8844.4915625490. The cubic root of 78225031 is about 427.6763628309.

The spelling of 78225031 in words is "seventy-eight million, two hundred twenty-five thousand, thirty-one".