78238907537 has 16 divisors (see below), whose sum is σ = 92714237952. Its totient is φ = 64607567760.

The previous prime is 78238907531. The next prime is 78238907581. The reversal of 78238907537 is 73570983287.

It is a cyclic number.

It is not a de Polignac number, because 78238907537 - 2⁴ = 78238907521 is a prime.

It is a super-2 number, since 2×78238907537² (a number of 23 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (78238907531) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 760013 + ... + 856794.

It is an arithmetic number, because the mean of its divisors is an integer number (5794639872).

Almost surely, 2^78238907537 is an apocalyptic number.

It is an amenable number.

78238907537 is a deficient number, since it is larger than the sum of its proper divisors (14475330415).

78238907537 is a wasteful number, since it uses less digits than its factorization.

78238907537 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1617068.

The product of its (nonzero) digits is 17781120, while the sum is 59.

The spelling of 78238907537 in words is "seventy-eight billion, two hundred thirty-eight million, nine hundred seven thousand, five hundred thirty-seven".