78375537 has 6 divisors (see below), whose sum is σ = 113209122. Its totient is φ = 52250352.

The previous prime is 78375523. The next prime is 78375581. The reversal of 78375537 is 73557387.

It can be written as a sum of positive squares in only one way, i.e., 78216336 + 159201 = 8844^2 + 399^2 .

It is not a de Polignac number, because 78375537 - 2¹⁸ = 78113393 is a prime.

It is a super-2 number, since 2×78375537² = 12285449600076738, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 78375492 and 78375501.

It is not an unprimeable number, because it can be changed into a prime (78375337) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 4354188 + ... + 4354205.

It is an arithmetic number, because the mean of its divisors is an integer number (18868187).

Almost surely, 2^78375537 is an apocalyptic number.

It is an amenable number.

78375537 is a deficient number, since it is larger than the sum of its proper divisors (34833585).

78375537 is a wasteful number, since it uses less digits than its factorization.

78375537 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8708399 (or 8708396 counting only the distinct ones).

The product of its digits is 617400, while the sum is 45.

The square root of 78375537 is about 8852.9959335809. The cubic root of 78375537 is about 427.9504721127.

The spelling of 78375537 in words is "seventy-eight million, three hundred seventy-five thousand, five hundred thirty-seven".