78375570 has 128 divisors (see below), whose sum is σ = 243855360. Its totient is φ = 15655680.

The previous prime is 78375523. The next prime is 78375581. The reversal of 78375570 is 7557387.

It is a super-2 number, since 2×78375570² = 12285459945649800, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (42).

It is an unprimeable number.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 51115 + ... + 52625.

It is an arithmetic number, because the mean of its divisors is an integer number (1905120).

Almost surely, 2^78375570 is an apocalyptic number.

78375570 is a gapful number since it is divisible by the number (70) formed by its first and last digit.

It is a practical number, because each smaller number is the sum of distinct divisors of 78375570, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (121927680).

78375570 is an abundant number, since it is smaller than the sum of its proper divisors (165479790).

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

78375570 is a wasteful number, since it uses less digits than its factorization.

78375570 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1560.

The product of its (nonzero) digits is 205800, while the sum is 42.

The square root of 78375570 is about 8852.9977973566. The cubic root of 78375570 is about 427.9505321755.

The spelling of 78375570 in words is "seventy-eight million, three hundred seventy-five thousand, five hundred seventy".