78220750 has 32 divisors (see below), whose sum is σ = 151167744. Its totient is φ = 30276000.

The previous prime is 78220699. The next prime is 78220789. The reversal of 78220750 is 5702287.

It is a super-2 number, since 2×78220750² = 12236971461125000, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (31).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2704 + ... + 12796.

It is an arithmetic number, because the mean of its divisors is an integer number (4723992).

Almost surely, 2^78220750 is an apocalyptic number.

78220750 is a deficient number, since it is larger than the sum of its proper divisors (72946994).

78220750 is a wasteful number, since it uses less digits than its factorization.

78220750 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10141 (or 10131 counting only the distinct ones).

The product of its (nonzero) digits is 7840, while the sum is 31.

The square root of 78220750 is about 8844.2495441954. The cubic root of 78220750 is about 427.6685609125.

The spelling of 78220750 in words is "seventy-eight million, two hundred twenty thousand, seven hundred fifty".