78340572 has 72 divisors (see below), whose sum is σ = 212481360. Its totient is φ = 24261120.

The previous prime is 78340541. The next prime is 78340597. The reversal of 78340572 is 27504387.

78340572 is a `hidden beast` number, since 7 + 83 + 4 + 0 + 572 = 666.

It is a super-2 number, since 2×78340572² = 12274490442574368, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 35172 + ... + 37332.

It is an arithmetic number, because the mean of its divisors is an integer number (2951130).

Almost surely, 2^78340572 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 78340572, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (106240680).

78340572 is an abundant number, since it is smaller than the sum of its proper divisors (134140788).

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

78340572 is a wasteful number, since it uses less digits than its factorization.

78340572 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2243 (or 2238 counting only the distinct ones).

The product of its (nonzero) digits is 47040, while the sum is 36.

The square root of 78340572 is about 8851.0209580590. The cubic root of 78340572 is about 427.8868233666.

The spelling of 78340572 in words is "seventy-eight million, three hundred forty thousand, five hundred seventy-two".