78622440 has 128 divisors (see below), whose sum is σ = 257040000. Its totient is φ = 19123200.

The previous prime is 78622429. The next prime is 78622469. The reversal of 78622440 is 4422687.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 157311 + ... + 157809.

It is an arithmetic number, because the mean of its divisors is an integer number (2008125).

Almost surely, 2^78622440 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 78622440, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (128520000).

78622440 is an abundant number, since it is smaller than the sum of its proper divisors (178417560).

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

78622440 is a wasteful number, since it uses less digits than its factorization.

78622440 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 627 (or 623 counting only the distinct ones).

The product of its (nonzero) digits is 21504, while the sum is 33.

The square root of 78622440 is about 8866.9295700372. The cubic root of 78622440 is about 428.3993855485.

The spelling of 78622440 in words is "seventy-eight million, six hundred twenty-two thousand, four hundred forty".