78990133 has 2 divisors, whose sum is σ = 78990134. Its totient is φ = 78990132.

The previous prime is 78990103. The next prime is 78990157. The reversal of 78990133 is 33109987.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 77035729 + 1954404 = 8777^2 + 1398^2 .

It is a cyclic number.

It is not a de Polignac number, because 78990133 - 2⁵ = 78990101 is a prime.

It is a super-2 number, since 2×78990133² = 12478882222715378, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (78990103) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 39495066 + 39495067.

It is an arithmetic number, because the mean of its divisors is an integer number (39495067).

Almost surely, 2^78990133 is an apocalyptic number.

It is an amenable number.

78990133 is a deficient number, since it is larger than the sum of its proper divisors (1).

78990133 is an equidigital number, since it uses as much as digits as its factorization.

78990133 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 40824, while the sum is 40.

The square root of 78990133 is about 8887.6393378669. The cubic root of 78990133 is about 429.0661779409.

The spelling of 78990133 in words is "seventy-eight million, nine hundred ninety thousand, one hundred thirty-three".