78920533 has 2 divisors, whose sum is σ = 78920534. Its totient is φ = 78920532.

The previous prime is 78920507. The next prime is 78920537. The reversal of 78920533 is 33502987.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 64609444 + 14311089 = 8038^2 + 3783^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-78920533 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 78920492 and 78920501.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (78920537) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 39460266 + 39460267.

It is an arithmetic number, because the mean of its divisors is an integer number (39460267).

Almost surely, 2^78920533 is an apocalyptic number.

It is an amenable number.

78920533 is a deficient number, since it is larger than the sum of its proper divisors (1).

78920533 is an equidigital number, since it uses as much as digits as its factorization.

78920533 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 45360, while the sum is 37.

The square root of 78920533 is about 8883.7229245401. The cubic root of 78920533 is about 428.9401209254.

The spelling of 78920533 in words is "seventy-eight million, nine hundred twenty thousand, five hundred thirty-three".