78151240 has 32 divisors (see below), whose sum is σ = 183487680. Its totient is φ = 29900992.

The previous prime is 78151231. The next prime is 78151273. The reversal of 78151240 is 4215187.

It is a super-2 number, since 2×78151240² = 12215232627075200, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 78151199 and 78151208.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 41554 + ... + 43393.

It is an arithmetic number, because the mean of its divisors is an integer number (5733990).

Almost surely, 2^78151240 is an apocalyptic number.

It is an amenable number.

78151240 is an abundant number, since it is smaller than the sum of its proper divisors (105336440).

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

78151240 is a wasteful number, since it uses less digits than its factorization.

78151240 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 84981 (or 84977 counting only the distinct ones).

The product of its (nonzero) digits is 2240, while the sum is 28.

The square root of 78151240 is about 8840.3189987692. The cubic root of 78151240 is about 427.5418423985.

The spelling of 78151240 in words is "seventy-eight million, one hundred fifty-one thousand, two hundred forty".