78291504 has 60 divisors (see below), whose sum is σ = 220566736. Its totient is φ = 25923456.

The previous prime is 78291497. The next prime is 78291541. The reversal of 78291504 is 40519287.

It is a super-2 number, since 2×78291504² = 12259119197164032, which contains 22 as substring.

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

It is a zygodrome in base 12.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 20877 + ... + 24339.

Almost surely, 2^78291504 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 78291504, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (110283368).

78291504 is an abundant number, since it is smaller than the sum of its proper divisors (142275232).

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

78291504 is a wasteful number, since it uses less digits than its factorization.

78291504 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3634 (or 3625 counting only the distinct ones).

The product of its (nonzero) digits is 20160, while the sum is 36.

The square root of 78291504 is about 8848.2486402677. The cubic root of 78291504 is about 427.7974701953.

The spelling of 78291504 in words is "seventy-eight million, two hundred ninety-one thousand, five hundred four".