78169725 has 24 divisors (see below), whose sum is σ = 143601920. Its totient is φ = 41690160.

The previous prime is 78169717. The next prime is 78169727. The reversal of 78169725 is 52796187.

It is not a de Polignac number, because 78169725 - 2³ = 78169717 is a prime.

It is a super-2 number, since 2×78169725² = 12221011813151250, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (78169727) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 57229 + ... + 58578.

Almost surely, 2^78169725 is an apocalyptic number.

78169725 is a gapful number since it is divisible by the number (75) formed by its first and last digit.

It is an amenable number.

78169725 is a deficient number, since it is larger than the sum of its proper divisors (65432195).

78169725 is a wasteful number, since it uses less digits than its factorization.

78169725 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 115826 (or 115815 counting only the distinct ones).

The product of its digits is 211680, while the sum is 45.

The square root of 78169725 is about 8841.3644309009. The cubic root of 78169725 is about 427.5755483595.

The spelling of 78169725 in words is "seventy-eight million, one hundred sixty-nine thousand, seven hundred twenty-five".