78250840 has 32 divisors (see below), whose sum is σ = 176352480. Its totient is φ = 31249152.

The previous prime is 78250793. The next prime is 78250859. The reversal of 78250840 is 4805287.

It is a super-2 number, since 2×78250840² = 12246387921411200, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 78250796 and 78250805.

It is a congruent number.

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, 31732 + ... + 34108.

It is an arithmetic number, because the mean of its divisors is an integer number (5511015).

Almost surely, 2^78250840 is an apocalyptic number.

It is an amenable number.

78250840 is an abundant number, since it is smaller than the sum of its proper divisors (98101640).

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

78250840 is a wasteful number, since it uses less digits than its factorization.

78250840 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3211 (or 3207 counting only the distinct ones).

The product of its (nonzero) digits is 17920, while the sum is 34.

The square root of 78250840 is about 8845.9504859568. The cubic root of 78250840 is about 427.7233924726.

The spelling of 78250840 in words is "seventy-eight million, two hundred fifty thousand, eight hundred forty".