78205061 has 4 divisors (see below), whose sum is σ = 85314624. Its totient is φ = 71095500.

The previous prime is 78205027. The next prime is 78205063. The reversal of 78205061 is 16050287.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 78205061 - 2¹⁰ = 78204037 is a prime.

It is a super-2 number, since 2×78205061² = 12232063132027442, 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 (78205063) 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, 3554765 + ... + 3554786.

It is an arithmetic number, because the mean of its divisors is an integer number (21328656).

Almost surely, 2^78205061 is an apocalyptic number.

It is an amenable number.

78205061 is a deficient number, since it is larger than the sum of its proper divisors (7109563).

78205061 is a wasteful number, since it uses less digits than its factorization.

78205061 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7109562.

The product of its (nonzero) digits is 3360, while the sum is 29.

The square root of 78205061 is about 8843.3625392155. The cubic root of 78205061 is about 427.6399660248.

The spelling of 78205061 in words is "seventy-eight million, two hundred five thousand, sixty-one".