78887970 has 48 divisors (see below), whose sum is σ = 234411840. Its totient is φ = 18031392.

The previous prime is 78887957. The next prime is 78887971. The reversal of 78887970 is 7978887.

78887970 = 1665² + 1666² + ... + 1692².

It is a super-3 number, since 3×78887970³ (a number of 25 digits) contains 333 as substring.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (78887971) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 61980 + ... + 63239.

It is an arithmetic number, because the mean of its divisors is an integer number (4883580).

Almost surely, 2^78887970 is an apocalyptic number.

78887970 is a gapful number since it is divisible by the number (70) formed by its first and last digit.

78887970 is an abundant number, since it is smaller than the sum of its proper divisors (155523870).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

78887970 is a wasteful number, since it uses less digits than its factorization.

78887970 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 125239 (or 125236 counting only the distinct ones).

The product of its (nonzero) digits is 1580544, while the sum is 54.

The square root of 78887970 is about 8881.8900015706. The cubic root of 78887970 is about 428.8811185420.

The spelling of 78887970 in words is "seventy-eight million, eight hundred eighty-seven thousand, nine hundred seventy".