78288837 has 32 divisors (see below), whose sum is σ = 116798976. Its totient is φ = 46248000.

The previous prime is 78288829. The next prime is 78288839. The reversal of 78288837 is 73888287.

It is a happy number.

It is not a de Polignac number, because 78288837 - 2³ = 78288829 is a prime.

It is a super-2 number, since 2×78288837² = 12258283997625138, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 78288837.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (78288839) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 276498 + ... + 276780.

It is an arithmetic number, because the mean of its divisors is an integer number (3649968).

Almost surely, 2^78288837 is an apocalyptic number.

It is an amenable number.

78288837 is a deficient number, since it is larger than the sum of its proper divisors (38510139).

78288837 is a wasteful number, since it uses less digits than its factorization.

78288837 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 481.

The product of its digits is 1204224, while the sum is 51.

The square root of 78288837 is about 8848.0979311940. The cubic root of 78288837 is about 427.7926125000.

The spelling of 78288837 in words is "seventy-eight million, two hundred eighty-eight thousand, eight hundred thirty-seven".